Which supplements have human evidence for hyperpigmentation? We compare studied formulations, glutathione, pine bark and vitamin C, with realistic limits.
Can supplements help hyperpigmentation? Some oral supplements have human evidence for improving pigmentation measures, including glutathione, a defined grape–licorice–vitamin C formulation and a specific French maritime pine-bark extract. Results depend on the formulation and the condition studied. Evidence for oral vitamin C alone is limited, and no supplement replaces sun protection or appropriate dermatological care. This guide compares the studies, their limits and realistic expectations.
What causes hyperpigmentation?
Hyperpigmentation describes areas of skin that appear darker because of increased melanin. Melanocytes produce this pigment, with the enzyme tyrosinase involved in its formation. Sun exposure, inflammation after acne or irritation, and hormonal influences can contribute to uneven pigmentation.
The cause matters: sun-related dark spots, post-inflammatory hyperpigmentation and melasma require different considerations. A study of general skin lightness does not automatically establish that a supplement treats melasma.
Which supplements have human evidence for hyperpigmentation?
The table compares the type of evidence available. The studies did not directly compare all these options, so their results cannot establish a single best supplement.
| Oral ingredient or formulation | Human evidence | Main limitation |
|---|---|---|
| Grape–licorice–vitamin C formulation | Two 12-week placebo-controlled trials studied a defined formulation, BELIGHT³™, in 58 Asian and 66 Caucasian adults. Pigmentation or complexion measures favoured the active groups. [1] [2] | Results apply to the studied formulation and populations; they do not establish the same effect for every product containing those ingredients. |
| Oral glutathione | A 2025 systematic review reported reductions in melanin index in oral studies. [3] | Study quality varied, and lasting benefits remain uncertain. |
| French maritime pine bark | A trial in 44 women with melasma found additional improvement with Pycnogenol® alongside sunscreen and a prescription topical combination. [4] | This was an add-on treatment, using a specific extract. |
| Vitamin C | Included in the studied grape–licorice formulation. [1] | A combination study cannot isolate vitamin C’s contribution or prove that oral vitamin C alone fades dark spots. |
| Curcumin and piperine | Their inclusion in pigmentation formulas is often based on antioxidant and inflammatory-signalling rationale. | That rationale does not establish a visible reduction in human dark spots. |
Why does the exact formulation matter?
The grape–licorice–vitamin C trials evaluated a defined mixture, rather than those ingredients separately. The 2023 trial enrolled 58 Asian adults with facial dark spots; 53 completed it. Participants identified with melasma during screening were excluded. It should therefore be described as dark-spot evidence, not a melasma trial. [1]
The 2025 trial enrolled 66 Caucasian adults with facial hyperpigmentation. After 12 weeks, the active group showed greater improvement in dark-spot lightness and clinical complexion assessments than placebo. [2]
The frequently quoted approximately 85% tyrosinase inhibition came from laboratory testing. It does not mean participants experienced an 85% reduction in dark spots. [1]
Does oral glutathione help with pigmentation?
Oral glutathione has promising human evidence, with important limitations. A systematic review published in 2025 included five randomized trials and one open-arm oral study. It reported improvements in melanin measurements, while finding substantial variation in study quality across the evidence assessed. The durability of the reported benefits was also a concern. [3]
A change in an instrument’s melanin reading does not necessarily mean a persistent dark patch has cleared. The evidence also does not establish that liposomal glutathione is superior for pigmentation: that claim would require direct comparative clinical data.
Can French maritime pine bark help melasma?
In a randomized trial, 44 women received either Pycnogenol® or placebo for 60 days. Both groups also used tinted sunscreen and a prescription triple-combination cream. The pine-bark group had greater improvement in melasma severity. [4]
This supports a possible complementary role for the tested extract. It does not show what pine bark would achieve alone, or establish equivalent results for other pine-bark ingredients.
What are the best oral vitamins for hyperpigmentation?
These studies do not establish a single best oral vitamin. Vitamin C is relevant to antioxidant biology, but evidence from a formula containing vitamin C cannot prove that vitamin C alone will fade facial pigmentation. Glutathione and botanical extracts are also not vitamins, even when they appear in products marketed as “brightening vitamins.”
When assessing a product, look for research on the actual formulation, dose and pigmentation concern. For more on the distinction between mechanism and visible results, read does vitamin C fade dark spots?
Where RADIANCE fits
RADIANCE is SKINĒDIT’s 90-day nutricosmetic protocol designed for concerns including dark spots, uneven tone and dullness, alongside daily photoprotection and appropriate topical care.
Its formulation includes the studied grape–licorice–vitamin C blend within a broader combination of ingredients. The trials cited here studied that blend, not the finished RADIANCE product; they explain part of the ingredient selection without establishing a finished-product result. SKINĒDIT publishes this article and makes RADIANCE.
Explore RADIANCE View the formulation, daily routine and 90-day protocol →
For the wider context, see what nutricosmetics are and how to assess their evidence.
Why does sunscreen still come first?
Sun exposure can sustain pigmentation while you are trying to improve it. For melasma, the American Academy of Dermatology recommends broad-spectrum SPF 30 or higher, shade and a wide-brimmed hat. A tinted sunscreen containing iron oxide adds protection against visible light, which can worsen melasma, particularly in darker skin tones. [5] [6]
Gentle skincare matters too: irritation can contribute to darker marks. A dermatologist can help identify the pigmentation type and choose an appropriate topical regimen.
How long do pigmentation supplements take to work?
The trials discussed here assessed outcomes over 60 days or 12 weeks. Those are study durations, not guaranteed deadlines for visible improvement. Pigmentation type, continued sun exposure and the treatment used all affect what a person may notice.
- Keep photoprotection consistent. Repeated exposure can work against your routine.
- Compare photographs under the same conditions. Use similar lighting, angle and camera settings, without filters.
- Track the whole routine. If you start a topical treatment and a supplement together, improvement cannot be attributed to the supplement alone.
- Reassess persistent or changing marks. A clinician can check the diagnosis and whether the approach needs to change.
Is oral tranexamic acid a supplement?
No. Oral tranexamic acid is a medication sometimes prescribed off-label for melasma. It requires clinician-led assessment, including consideration of clotting risks and contraindications. It should not be treated as an interchangeable alternative to an over-the-counter supplement. [7]
Frequently asked questions
Which supplement is best for hyperpigmentation?
No single best option is established by the studies reviewed here. Check whether the research concerns your pigmentation type, the exact formulation and a meaningful clinical outcome. Results from different study designs cannot be used as a reliable product ranking.
Can vitamin C tablets remove dark spots?
Direct evidence for oral vitamin C alone is limited. Trials of mixtures containing vitamin C do not show how much of the result came from that vitamin. A tablet should not be expected to replace sun protection or targeted treatment.
Can supplements help melasma?
Some have been studied as additions to topical treatment and photoprotection. Melasma is often persistent or recurrent, so evidence from general skin-brightening studies should not be presented as proof of a melasma cure.
Are results permanent?
The short studies discussed here do not establish permanent results. Continued management of triggers, especially sun exposure, remains relevant after any improvement.
Related reading
References
- Pouchieu C, et al. Oral formulation and skin lightening: laboratory testing and a randomized trial in Asian participants. Cosmetics. 2023;10(5):143. Read the 2023 study.
- Tursi F, et al. Clinical Efficacy of Belight3™ on Dark Spot Pigmentation in Caucasian Subjects. Cosmetics. 2025;12(1):27. Read the 2025 study.
- Sarkar R, et al. Glutathione as a skin-lightening agent and in melasma: a systematic review. International Journal of Dermatology. 2025;64(6):992–1004. Read the systematic review.
- Lima PB, et al. French maritime pine bark added to triple-combination cream for facial melasma: a randomized trial. Journal of the European Academy of Dermatology and Venereology. 2021;35(2):502–508. Read the pine-bark trial.
- American Academy of Dermatology. Melasma: diagnosis and treatment.
- American Academy of Dermatology. Melasma: self-care.
- Bala HR, et al. Oral Tranexamic Acid for the Treatment of Melasma: A Review. Dermatologic Surgery. 2018;44(6):814–825. Read the medication review.
Editorial note: This article explains published evidence and does not provide individual medical advice. Consult a qualified healthcare professional about persistent, sudden or changing pigmentation and whether a supplement is suitable for you.
Jaouad Bentaguena est le fondateur de SKINĒDIT Paris. Il recherche et écrit lui-même le journal Intelligence de SKINĒDIT, à partir de la littérature évaluée par les pairs et en dialogue avec les scientifiques et partenaires cliniques associés aux protocoles, afin de rendre la science profonde de la peau et du cheveu claire et utile.
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