How to Reduce Hyperpigmentation? A Dermatology-Backed Guide

Dark spots, patches, and uneven skin tone can be frustrating—especially when they seem to linger long after the original breakout, sun exposure, or irritation has passed. Hyperpigmentation is one of the most common skin concerns, but treating it effectively is less about finding a quick fix and more about understanding what is causing the excess pigment in the first place.

The most effective approach combines three things: protecting your skin from further UV exposure, using proven brightening ingredients consistently, and maintaining a healthy skin barrier. This is important because irritation can sometimes worsen pigmentation, making a gentle and consistent routine just as important as the treatment itself. While hyperpigmentation rarely disappears overnight, the right combination of daily habits and targeted skincare can gradually make dark spots less noticeable and help create a more even-looking complexion.

Different types of pigmentation can have different triggers. Post-acne marks may develop after inflammation, sun exposure can lead to accumulated pigmentation over time, while hormonal changes can contribute to conditions such as melasma. Understanding the underlying cause helps you choose an approach that is both effective and appropriate for your skin.

In this guide, we'll explain what hyperpigmentation is, why it develops, which skincare ingredients have the strongest evidence for improving its appearance, how to build a practical routine, and which common mistakes can slow your progress. Whether you're dealing with post-acne marks, sun spots, or uneven patches, you'll learn how to approach pigmentation with patience, consistency, and smarter skincare.

What is hyperpigmentation?

Hyperpigmentation is not a single condition. It is a broad term that describes any area of skin that appears darker than the surrounding skin due to an excess or uneven distribution of melanin, the pigment that gives skin, hair and eyes their colour.

The role of melanin

Melanin is produced by specialised cells called melanocytes, located in the basal layer of the epidermis. Once produced, melanin is packaged into small structures called melanosomes, which are transferred to neighbouring keratinocytes (the main cells of the outer skin layer). This transfer is what gives the skin its visible colour.

The key enzyme in melanin production is tyrosinase. Many of the most effective topical ingredients for hyperpigmentation work by inhibiting this enzyme, essentially reducing the rate at which melanocytes produce new pigment.

Types of hyperpigmentation

Different forms of hyperpigmentation behave differently, respond to different treatments, and may require different timelines. Knowing which type you are dealing with helps you choose the right approach.

Key distinction: PIH is triggered by inflammation. Melasma is triggered primarily by hormonal and vascular factors (with UV exposure as a major aggravator). Solar lentigines are a direct result of accumulated sun damage. This distinction matters because some treatments that work well for one type may be less effective, or potentially counterproductive, for another.

Why hyperpigmentation happens

Understanding the triggers is important because successful reduction depends as much on removing or managing the trigger as it does on treating the existing pigment.

Sun exposure and UV damage

UV radiation is the single most important aggravating factor for most forms of hyperpigmentation. UV exposure stimulates melanocytes to produce more melanin, darkens existing pigment, and can trigger new pigment formation. It also contributes to the breakdown of the skin barrier, making the skin more susceptible to irritation.

In high-UV climates, including much of South Asia, the Middle East, parts of Africa and the southern United States, the intensity and year-round nature of UV exposure means sun protection is not a seasonal concern but a daily necessity. Even short periods of unprotected exposure can darken existing pigment and slow the fading process.

Inflammation and skin injury

Whenever the skin experiences inflammation, whether from a breakout, a scratch, a chemical peel performed too aggressively, or even over-exfoliation, the inflammatory response can overproduce melanin. This is the mechanism behind post-inflammatory hyperpigmentation (PIH). In some people, particularly those with Fitzpatrick skin types IV to VI, even minor inflammation can leave behind persistent dark marks.

This is also why treating hyperpigmentation with overly aggressive products can backfire: the irritation causes new inflammation, which in turn triggers more pigment.

Hormonal influences

Melasma is closely linked to hormonal factors. It is more common in women, particularly during pregnancy, when starting or changing hormonal contraception, or during hormone replacement therapy. However, melasma also affects men, and hormonal changes alone are rarely sufficient to cause it without UV exposure and genetic predisposition.

Other contributing factors

•        Genetics: A family history of hyperpigmentation increases individual risk.

•        Certain medications: Some drugs, including certain antibiotics, antimalarials and chemotherapy agents, can cause pigmentary changes.

•        Visible light: Emerging research suggests that high-energy visible light (blue light) may contribute to pigmentation in some people, particularly those with deeper skin tones. This is relevant when considering tinted sunscreens, which offer some visible-light protection.

•        Skin irritation from products: Harsh cleansers, frequent exfoliation, fragrance sensitivity and combining too many active ingredients can cause low-grade inflammation that worsens pigmentation over time.

The three-part strategy to reduce hyperpigmentation

A common mistake is to view hyperpigmentation treatment as a single product problem. In reality, effective reduction requires three coordinated actions:

1. Protect: why sunscreen comes first

No amount of brightening serum will outperform daily UV exposure. Every time the skin is exposed to UV without protection, the pigmentation process is re-triggered. Sunscreen does not fade existing pigment by itself, but without it, any progress from treatment ingredients is continuously undermined. Think of sunscreen as the foundation: everything else depends on it.

2. Treat: targeting existing pigment

Once protection is in place, active ingredients can work to reduce existing pigment. The mechanisms differ, which is why combination approaches often work better than relying on a single ingredient. Ingredients can:

•        Inhibit tyrosinase (reducing new melanin production)

•        Block the transfer of melanin to skin cells

•        Accelerate the shedding of pigmented surface cells

•        Reduce the inflammation that drives pigment production

The ingredient section below explains which ingredients fall into each category.

3. Support: protecting the skin barrier

A healthy skin barrier helps keep irritants out and moisture in, reducing the low-level inflammation that can trigger pigment. Many people with hyperpigmentation become impatient and over-use actives, damaging the barrier and worsening the problem. A gentle cleanser and a well-formulated moisturiser are not optional extras, they are part of the treatment plan.

Sun protection: the non-negotiable foundation

What to look for in a sunscreen

For hyperpigmentation, the sunscreen should offer:

•        Broad-spectrum protection, this means protection against both UVA and UVB. UVA is particularly relevant for pigmentation because it penetrates deeply and contributes to photo-ageing and pigment changes.

•        SPF 50+, higher SPF provides a greater margin for error given that most people apply less than the recommended amount.

•        A high UVA protection rating, in some regions this is indicated as a PA rating (look for PA++++ or PA+++). In others, the UVA seal or star rating is used.

•        A texture you will use every day, the best sunscreen is one you will apply consistently. In humid climates, lightweight gels, fluids or non-comedogenic formulations may be preferable. In drier climates, more moisturising formulations may suit better.

How to apply sunscreen correctly

The recommended amount for the face and neck is approximately 1/4 teaspoon, or roughly the length of two fingers. Most people apply about half the required amount, which reduces the effective protection significantly.

Reapply every two to three hours if you are outdoors, sweating or in and out of water. Even when indoors near windows, a morning application still matters because UVA penetrates glass.

Why tinted sunscreen may help

Tinted sunscreens containing iron oxides may provide additional protection against visible light, which some research suggests can contribute to pigmentary changes, particularly in people with Fitzpatrick skin types IV to VI. If you struggle with melasma or persistent pigmentation, a tinted broad-spectrum sunscreen may offer a useful additional layer of protection. This is not a substitute for UV protection; it is a complementary consideration.

Ingredients that may help reduce hyperpigmentation

This section explains how key ingredients work, what they are best suited to, and what to know before using them. The evidence levels described are based on peer-reviewed research and clinical use, not marketing claims.

1. Vitamin C

How it works: Vitamin C is a potent antioxidant that inhibits tyrosinase, reducing new melanin production. It also helps neutralise free radicals generated by UV exposure and environmental stressors, which can trigger inflammation and pigment.

Best suited to: General skin brightening, fading superficial dark spots, supporting overall even tone. Most useful in a morning routine alongside sunscreen.

What to know: Ascorbic acid is unstable and can oxidise when exposed to light and air. Formulations that use stabilised derivatives or are packaged in opaque, air-restricted containers tend to be more reliable. Concentrations between 10% and 20% are commonly used. Some people find ascorbic acid irritating; starting every other morning is a sensible approach.

2. Niacinamide

How it works: Rather than inhibiting melanin production directly, niacinamide works by inhibiting the transfer of melanosomes from melanocytes to keratinocytes. In practical terms, this means pigment is less likely to appear on the skin's surface.

Best suited to: Uneven skin tone, PIH, and as a supportive ingredient for people who cannot tolerate stronger actives. Also helps support barrier function and regulate sebum.

What to know: Niacinamide is one of the best-tolerated ingredients for hyperpigmentation. Concentrations of 2% to 5% are well studied for pigmentation and barrier support. It can be used both morning and evening and combines well with most other actives.

3. Azelaic acid

How it works: Azelaic acid is a naturally occurring dicarboxylic acid that inhibits tyrosinase and has anti-inflammatory properties. It is unique in that it addresses both pigmentation and active acne, making it particularly useful for acne-related PIH.

Best suited to: Post-acne dark marks, active breakouts with pigmentation, and people with rosacea-prone skin who also experience pigmentation.

What to know: Azelaic acid is available at 10% in some over-the-counter formulations and at 15% to 20% by prescription in most countries. It is generally well tolerated but can cause temporary itching or tingling when first introduced.

4. Tranexamic acid

How it works: Tranexamic acid reduces plasmin activity, which in turn reduces the inflammatory signals that stimulate melanocytes. It also inhibits UV-induced pigmentation pathways. Originally used as an oral medication to reduce bleeding, topical formulations have gained significant attention for pigmentation.

Best suited to: Melasma, stubborn pigmentation, and pigmentation that worsens with hormonal fluctuations. Also useful for PIH.

What to know: Topical concentrations between 1% and 5% are commonly used. Oral tranexamic acid is also used for melasma but should only be taken under medical supervision due to potential side effects, including blood-clotting risks. Topical use is generally well tolerated.

5. Kojic acid

How it works: Kojic acid is a by-product of fermentation that inhibits tyrosinase, reducing melanin production.

Best suited to: General skin brightening, dark spots from sun exposure, and superficial pigmentation.

What to know: Kojic acid is often used in concentrations of 1% to 4%. It can cause contact dermatitis in some individuals, so patch testing is advisable. It is frequently combined with other tyrosinase inhibitors for enhanced effect.

6. Alpha arbutin

How it works: Alpha arbutin is a synthetic derivative of hydroquinone that inhibits tyrosinase. It is converted slowly into hydroquinone in the skin, providing a gentler brightening effect.

Best suited to: Mild to moderate pigmentation, dark spots, and people who want a gentler alternative to stronger actives.

What to know: Typical concentrations are around 2%. Alpha arbutin is generally well tolerated and combines well with vitamin C and niacinamide. It is not the same as hydroquinone, which is a prescription medication with a different risk profile.

7. Retinoids (retinol, retinaldehyde, tretinoin)

How it works: Retinoids accelerate epidermal cell turnover, helping to disperse existing pigment granules and bring fresher, less pigmented cells to the surface. They also support collagen production over the long term.

Best suited to: PIH, photodamaged skin, and general skin texture improvement alongside pigmentation treatment.

What to know: Retinoids require careful introduction. Start with low concentrations, use them only at night, and build frequency gradually, for example, once or twice weekly, then increasing as tolerated. Retinoids increase sun sensitivity, so daily sunscreen is essential. Irritation from retinoids can worsen pigmentation if not managed; this is a common pitfall.

8. Alpha hydroxy acids (AHAs, glycolic acid, lactic acid)

How it works: AHAs exfoliate the surface layer of the skin, accelerating the removal of pigmented dead skin cells and improving overall tone.

Best suited to: Superficial dark spots, dull skin, and as a supportive step in a broader routine.

What to know: AHAs increase sun sensitivity and can irritate the skin if overused. In people with deeper skin tones, aggressive AHA use can trigger PIH. Lower concentrations (5% to 10%) and less frequent use are generally safer than high-strength peels for at-home use. Lactic acid tends to be better tolerated than glycolic acid for sensitive skin.

9. Licorice extract

How it works: Glabridin, the active component of licorice root extract, inhibits tyrosinase and has anti-inflammatory properties.

Best suited to: Sensitive skin, mild pigmentation, and as a supportive ingredient in combination formulations.

What to know: Evidence for licorice extract is more limited than for ingredients like vitamin C or azelaic acid, but it appears in many brightening formulations and is generally well tolerated.

10. Cysteamine

How it works: Cysteamine is a naturally occurring compound that inhibits tyrosinase through a different mechanism from most other agents and also has antioxidant properties.

Best suited to: Melasma and stubborn pigmentation, including in some people who have not responded to other treatments.

What to know: Cysteamine is typically used at 5%. It has a distinct, often unpleasant odour (often described as sulphuric) that may persist during application. Some studies suggest efficacy comparable to hydroquinone for melasma, but the body of evidence is still growing. It should only be used as directed and usually for limited treatment periods.

Ingredient comparison table

Note: Evidence levels vary. Vitamin C, niacinamide, azelaic acid and retinoids have the most established clinical evidence for hyperpigmentation. Tranexamic acid and cysteamine have strong emerging evidence, particularly for melasma. Licorice extract and some botanical agents have more limited evidence and are best considered supportive rather than primary treatments.

How to choose the right ingredients for your skin type and concern

Decision framework: matching ingredient to concern

1. If your primary concern is post-acne dark marks (PIH):

Prioritise azelaic acid, niacinamide and a retinoid. Azelaic acid addresses both active breakouts and pigment; niacinamide supports the barrier and reduces pigment transfer; a retinoid accelerates cell turnover. Introduce these gradually and pair with a daily sunscreen.

2. If your primary concern is melasma:

Prioritise broad-spectrum sun protection (including a tinted sunscreen if feasible), tranexamic acid, and a tyrosinase inhibitor such as vitamin C or azelaic acid. Melasma is a chronic condition; management is ongoing rather than a one-time treatment. Hormonal triggers may need discussion with a dermatologist.

3. If your primary concern is sun spots (solar lentigines):

Prioritise a retinoid, vitamin C and an AHA used carefully. Sun spots respond best when sun protection is combined with ingredients that accelerate cell turnover and reduce melanin production.

4. If your skin is sensitive or barrier-compromised:

Prioritise niacinamide, azelaic acid (at lower strengths) and licorice-based formulations. Avoid layering multiple strong actives. Repair the barrier first with a gentle cleanser and moisturiser before introducing more aggressive treatments.

Guidance by skin type

How to build an effective routine for hyperpigmentation

Consistency matters more than intensity. A routine should be simple enough to maintain daily and gentle enough to avoid triggering new inflammation.

Morning routine (step-by-step)

•        Cleanse, Use a gentle, pH-balanced cleanser. Avoid harsh foaming cleansers that strip the skin.

•        Vitamin C serum (optional but useful), If tolerated, apply a stabilised vitamin C serum to clean, dry skin. This provides antioxidant support throughout the day.

•        Treatment serum (optional), If using niacinamide or tranexamic acid, it can be applied after vitamin C or instead of it. Do not feel the need to use every ingredient every day.

•        Moisturise, Use a moisturiser suited to your skin type. Even oily skin benefits from lightweight hydration.

•        Sunscreen, Apply generously as the final morning step. This is non-negotiable.

Evening routine (step-by-step)

•        Cleanse, If you have worn sunscreen or makeup, a double cleanse (oil-based cleanser followed by a water-based cleanser) can help remove all residue.

Treatment step, This is where your primary active goes:

•        Azelaic acid or tranexamic acid can be used nightly or on alternate nights.

•        Retinoid should be applied on clean, dry skin, starting once or twice weekly and increasing gradually.

•        AHA (if used) should be applied on evenings when not using a retinoid, to avoid over-exfoliation.

•        Moisturise, Always follow actives with a moisturiser to support the barrier and reduce irritation.

How to introduce new products safely

The most common reason hyperpigmentation treatments fail is that people introduce too many actives too quickly, causing irritation and triggering more pigment. A safer approach:

•        Introduce one new active at a time.

•        Wait at least two to four weeks before adding another.

•        Start with lower concentrations and build up.

•        If irritation develops (redness, stinging, peeling beyond expected), stop the new product and allow the barrier to recover before re-introducing at a lower frequency.

•        Keep a note of what you are using and when, this makes it easier to identify what is helping or causing problems.

Common mistakes that slow progress

1. Skipping sunscreen

Even the most effective brightening serum cannot compensate for daily unprotected UV exposure. If you do one thing, make it sunscreen.

2. Using too many actives at once

Layering vitamin C, AHA, retinoid, azelaic acid and multiple brightening serums in the same routine is a recipe for irritation. Irritation triggers inflammation, and inflammation triggers more pigment. Choose two or three well-matched actives and use them consistently.

3. Over-exfoliating

Physical scrubs and frequent high-strength chemical exfoliation can damage the barrier and worsen pigmentation, particularly in deeper skin tones. Less is often more.

4. Expecting overnight results

Pigments that took months or years to form will not disappear in a week. Realistic expectations prevent frustration and the temptation to over-treat.

5. Stopping treatment too early

Some people stop using a product after four weeks because they see no change. Most evidence-based ingredients take 8 to 12 weeks of consistent use to show meaningful improvement.

6. Ignoring the type of hyperpigmentation

Treating melasma with aggressive AHAs or high-strength retinoids may cause more harm than benefit. Understanding whether you have PIH, melasma or sun spots changes the approach.

7. Not patch testing

New products can cause irritation or contact dermatitis. A patch test on a small area behind the ear or on the jawline for a few days can help identify sensitivity before full application.

8. Believing natural remedies are always safer

Some home remedies, lemon juice, for example, are acidic and can irritate the skin, paradoxically increasing the risk of pigmentation. “Natural” does not automatically mean gentle or effective.

9. Forgetting the skin barrier

A compromised barrier allows irritants in and moisture out, fuelling inflammation that worsens pigmentation. A gentle, hydrating routine supports all other treatment efforts.

10. Failing to address the underlying trigger

If acne is causing PIH, treating the pigmentation alone is only half the battle. Managing the acne itself, often with the same ingredient (azelaic acid) or with professional guidance, is necessary to prevent new marks from forming.

Professional treatments: what to know before considering them

Professional treatments can accelerate results, but they carry risks, particularly for people with deeper skin tones. This section provides an overview, not a recommendation. Always consult a qualified dermatologist before pursuing any in-clinic treatment.

1. Chemical peels

Chemical peels use acids (such as glycolic acid, salicylic acid, lactic acid or trichloroacetic acid) at higher concentrations than home products to remove surface layers and stimulate renewal. Superficial peels may help fade dark spots, but medium-depth and deep peels carry a higher risk of PIH, especially in Fitzpatrick skin types IV to VI. Peels should be performed by a professional who understands the patient's skin type and uses appropriate concentrations.

2. Laser and light-based treatments

Various laser and light devices target pigmentation:

•        Q-switched lasers target melanin directly and may be effective for specific types of pigmentation.

•        Picosecond lasers deliver ultra-short pulses and are used for a range of pigmentary concerns.

•        Fractional lasers create controlled micro-injuries to stimulate skin renewal.

However, laser treatments are not risk-free. In darker skin tones, some lasers can trigger paradoxical worsening of pigmentation. Intense pulsed light (IPL) is generally considered less suitable for deeper skin types for this reason. A patch test and thorough consultation are essential.

3. Microneedling

Microneedling creates micro-channels in the skin, stimulating collagen production and potentially improving the appearance of pigmentation over multiple sessions. It is generally considered safer than some lasers for deeper skin tones, but it still requires professional expertise. Microneedling should not be attempted at home with unregulated devices.

4. Prescription topical treatments

In some cases, a dermatologist may prescribe:

•        Hydroquinone, a potent tyrosinase inhibitor. It is prescription-only in most countries and is usually recommended for short courses under medical supervision due to concerns about side effects, including ochronosis (a bluish-black discolouration) with prolonged use.

•        Tretinoin, a prescription retinoid that is more potent than over-the-counter retinol.

•        Combination creams, often containing hydroquinone, a retinoid and a corticosteroid, for short-term treatment of melasma.

These are medical treatments, not cosmetic products. They should only be used under the supervision of a qualified professional.

5. When to consider professional help

Professional treatment may be worth exploring if:

•        You have used evidence-based skincare consistently for three to six months with minimal improvement.

•        Your hyperpigmentation is causing significant distress.

•        You suspect your pigmentation is melasma and would benefit from a definitive diagnosis and targeted treatment plan.

•        You have a history of worsening pigmentation after cosmetic procedures.

•        You are considering laser or peel treatments and need an assessment of your individual risk.

How long does it take to see results?

Realistic timelines by type of hyperpigmentation

Factors that affect how quickly pigment fades

•        Depth of pigment: Deeper pigment takes longer to reach the surface and shed.

•        UV exposure: Continued sun exposure slows fading dramatically.

•        Skin barrier health: A healthy barrier supports faster, less irritated treatment.

•        Consistency: Irregular product use produces irregular results.

•        Skin type and genetics: Deeper skin tones may retain pigment longer due to higher baseline melanin levels.

•        Trigger management: If the underlying trigger (acne, hormonal factors, medication) persists, new pigment will continue to form.

When to see a dermatologist

You should consult a dermatologist if:

•        You have a new or changing pigmented lesion that is asymmetric, has irregular borders, multiple colours, a diameter larger than 6mm, or is evolving, this could indicate a skin cancer concern and requires prompt assessment.

•        Your hyperpigmentation is not improving after consistent use of evidence-based skincare for three to six months.

•        You suspect melasma and want a definitive diagnosis and treatment plan.

•        You have experienced worsening pigmentation after using skincare products or after cosmetic procedures.

•        You are considering prescription treatments, chemical peels, lasers or microneedling.

•        Your hyperpigmentation is causing significant emotional or psychological distress.

A dermatologist can provide a precise diagnosis, which is especially important because different types of hyperpigmentation require different management strategies.

FAQ

What is the fastest way to reduce hyperpigmentation?

The fastest safe approach is a combination of rigorous daily sun protection, evidence-based topical ingredients (such as azelaic acid, vitamin C, niacinamide or tranexamic acid), and, where appropriate, professional treatments performed by a dermatologist. However, “fast” in the context of hyperpigmentation usually means weeks to months, not days. Any treatment that promises overnight results should be viewed with caution.

Can hyperpigmentation be removed permanently?

This depends on the type. Post-inflammatory hyperpigmentation can fade completely with consistent treatment and trigger management. Solar lentigines may be removed with professional treatments, though new ones will form with continued sun exposure. Melasma is a chronic condition that can be managed and improved significantly, but may recur, particularly with UV exposure or hormonal changes.

Is vitamin C good for hyperpigmentation?

Vitamin C is one of the most widely used ingredients for hyperpigmentation. It inhibits tyrosinase, reducing new melanin production, and provides antioxidant protection that helps prevent UV-triggered pigment formation. It is best used in the morning alongside sunscreen.

How long does it take for hyperpigmentation to fade?

Visible fading typically takes 8 to 12 weeks of consistent treatment. Superficial post-inflammatory marks may begin to improve within this period. Deeper pigment, melasma and long-standing sun spots may take 3 to 6 months or more to show significant improvement. Consistency is more important than intensity.

Does sunscreen alone reduce hyperpigmentation?

Sunscreen alone will not remove existing pigment, but it prevents further darkening and allows the skin's natural cell turnover to gradually shed pigmented cells. Without sunscreen, all other treatments are significantly less effective. In some cases, consistent sunscreen use alone can produce modest improvement over several months.

What is the best ingredient for hyperpigmentation?

There is no single “best” ingredient because different types of hyperpigmentation respond to different mechanisms. Azelaic acid is excellent for acne-related PIH. Tranexamic acid shows strong promise for melasma. Vitamin C and niacinamide are versatile and well tolerated. Retinoids support cell turnover. The most effective approach is often a combination matched to the specific concern, under consistent sun protection.

Is hyperpigmentation the same as melasma?

No. Melasma is one specific type of hyperpigmentation, typically triggered by hormonal factors and UV exposure, appearing as symmetrical brown or grey-brown patches on the face. Hyperpigmentation is the broader category that also includes post-inflammatory hyperpigmentation, sun spots and freckles.

Can hyperpigmentation get darker before it fades?

With appropriate treatment, pigment should not worsen. However, if treatment causes irritation or inflammation (for example, from over-use of exfoliants or retinoids), the skin may produce more pigment, making the area appear darker. This is why gradual introduction of actives and barrier support are essential. If you notice darkening alongside irritation, stop the product and allow the skin to recover.

Does niacinamide help hyperpigmentation?

Yes. Niacinamide works by inhibiting the transfer of melanin from melanocytes to skin cells, which helps reduce the appearance of hyperpigmentation. It is one of the best-tolerated ingredients available and also supports skin barrier function, making it a strong first-line option for many people.

Can I use vitamin C and niacinamide together?

Yes. Despite a longstanding myth that they should not be combined, current formulation science supports the combined use of vitamin C and niacinamide for most people. If you experience any sensitivity, use them at different times of day, vitamin C in the morning, niacinamide in the evening, but for most skin types, layering them in the same routine is not problematic.