Tratamiento del Cáncer (reducción de efectos secundarios)

Alpha-lipoic acid (ALA) inhibits melanin synthesis by scavenging free radicals and chelating metals involved in melanogenesis, and raises intracellular glutathione levels. A multicenter, randomized, controlled trial used oral glutathione plus ALA as a skin-lightening agent, demonstrating significant depigmentation. It is listed among antioxidants reviewed for melasma treatment.

Aloe vera contains aloesin, which inhibits tyrosinase, tyrosine hydroxylase, and DOPA oxidase. A single RCT found that aloesin effectively treats UVR-induced pigmentation independently and synergistically with arbutin (combined efficacy 63.3% melanin reduction). Aloe vera is also identified in systematic reviews as a natural depigmenting agent.

Alpha hydroxy acids (AHAs), including glycolic acid and lactic acid, treat hyperpigmentation through epidermal exfoliation, accelerating melanin shedding and increasing skin cell turnover. Chemical peels with AHAs are used as first- and second-line treatments for melasma and PIH in clinical dermatology.

Arbutin competitively inhibits tyrosinase, the key enzyme in melanin synthesis, reducing hyperpigmentation in melasma, sun spots, and post-inflammatory pigmentation. A 10% topical concentration produced a 43.5% reduction in UV-induced hyperpigmentation in clinical study; combined with aloesin, melanin reduction reached 63.3%. It has been used for over 30 years in cosmetics and has been clinically evaluated in multiple studies including combination with laser therapy.

Ascorbyl palmitate inhibits melanogenesis by acting as a reducing agent on tyrosinase intermediates, interrupting the conversion of tyrosine/DOPA to melanin. A placebo-controlled, split-face 12-week clinical trial in 33 Asian women found that emulsion formulations containing AP and sodium ascorbyl phosphate significantly reduced facial skin melanin content. Transfersome-based delivery of AP has also been investigated for melasma treatment.

Azelaic acid inhibits tyrosinase activity, mitochondrial oxidoreductase, and DNA synthesis in melanocytes, producing documented depigmentation in melasma and post-inflammatory hyperpigmentation (PIH). Two RCTs confirmed its efficacy against both melasma and PIH. A 15% gel formulation was evaluated in a 16-week baseline-controlled study for PIH and acne.

Caffeic acid is a phenylpropanoid and one of the principal actives in Polypodium leucotomos extract, contributing to its anti-melasma efficacy. It inhibits tyrosinase and UV-induced melanogenesis, and is documented in reviews of antioxidants for melasma treatment.

In vitro evidence demonstrates that ceramides—particularly C2-ceramide—inhibit melanogenesis by downregulating tyrosinase activity and reducing expression of microphthalmia-associated transcription factor (MITF), with a reported pigmentation-inhibiting effect stronger than kojic acid in human melanocyte cultures. An open-label clinical study of oral rice ceramide supplementation in 50 participants showed a measurable reduction in melanin index over three months. Human clinical evidence remains limited, with most mechanistic data derived from cell and animal models.

Topical sodium copper chlorophyllin complex has been clinically studied for solar lentigines (hyperpigmented sun spots). A 2015 pilot study (n=10, 8 weeks) showed statistically significant improvement in facial solar lentigines and photodamage markers. A 2016 biopsy study confirmed upregulation of hyaluronic acid precursors and collagen biomarkers. Studies are small and uncontrolled but published in peer-reviewed dermatology journals.

Coix seed and its constituent coixol inhibit tyrosinase—the rate-limiting enzyme in melanin synthesis—reducing melanogenesis in cell models. A small human case report documented oral coix-seed reactive derivatives reducing friction melanosis markedly within three months.

Copper is an obligatory cofactor for tyrosinase, the key enzyme in melanin biosynthesis. Both excess and deficiency of copper can disrupt melanogenesis and pigmentation balance. Copper deficiency causes hypopigmentation, while dysregulated copper-tyrosinase activity is implicated in certain hyperpigmentation conditions.

Curcumin, the principal polyphenol in turmeric, inhibits tyrosinase and melanin synthesis, with in vitro studies in B16F10 melanoma cells demonstrating significant anti-melanogenic activity. It is listed in multiple systematic reviews as a natural depigmenting agent, though oral bioavailability is poor without enhanced formulations.

EGCG, the principal catechin in green tea, inhibits tyrosinase and melanin synthesis, and has been identified in systematic reviews as a natural depigmenting agent. It reduces UV-induced pigmentation through antioxidant and anti-inflammatory mechanisms.

Ellagic acid is a tyrosinase inhibitor shown to treat melasma and hyperpigmentation in a randomized, prospective, open-label clinical study. It is found in pomegranate, strawberry, and other fruits. A 2026 pilot trial using a formulation containing ellagic acid, niacinamide, and Polypodium leucotomos showed a 44% reduction in MASI score at 24 weeks.

Ferulic acid is a hydroxycinnamic acid found in Polypodium leucotomos extract and numerous plants, with documented melanogenesis-inhibiting and photoprotective properties. It is used in combination topical formulations (notably with vitamin C and E) for hyperpigmentation, where it enhances stability and efficacy of co-actives.

Fisetin, a dietary flavonoid found in strawberries, grapes, and onions, inhibits tyrosinase activity and melanin content in human melanoma cells via multiple pathways including PKCα-induced β-catenin degradation and ERK/MITF inhibition. A 2025 mechanistic study confirmed significant anti-melanogenic activity at non-toxic concentrations.

Genistein, a soy isoflavone, inhibits melanocyte proliferation and melanosome transfer to keratinocytes, reducing hyperpigmentation. Genistein content in soy extracts correlates strongly with antimelanogenic activity in cell-based studies. It is identified in systematic reviews as an active depigmenting compound.

Glabridin, the principal isoflavan of licorice root, inhibits tyrosinase and UVB-induced pigmentation, with in vitro potency reportedly 16 times greater than hydroquinone. A single-center, double-blind clinical study of 18 subjects demonstrated superior lightening of UV-induced hyperpigmentation compared to 4% hydroquinone cream.

Green tea, rich in catechins especially EGCG, exhibits antimelanogenic and photoprotective properties relevant to hyperpigmentation. EGCG inhibits multiple steps in the melanogenesis pathway. Green tea extracts have been reviewed in systematic research as one of several natural ingredients with in vitro and clinical evidence for depigmenting effects.

H. italicum extracts have been shown to inhibit tyrosinase — the rate-limiting enzyme in melanin synthesis — in vitro, with one cyclodextrin-based extract showing activity comparable to the standard depigmenting agent kojic acid. Flavonoids and phenolic acids in the plant are described as depigmentation agents.

L-cystine has been studied in randomized controlled trials for its skin-lightening and anti-dark-spot effects, particularly when combined with reduced glutathione. The proposed mechanism involves shifting melanin synthesis from darker eumelanin toward lighter pheomelanin via thiol-mediated tyrosinase modulation. In vitro evidence shows L-cystine inhibits tyrosinase activity and suppresses melanin output in melanocytes.

Glutathione inhibits tyrosinase and shifts melanin synthesis from dark eumelanin to lighter phaeomelanin, reducing hyperpigmentation. A multicenter, randomized, controlled trial (Indonesia) confirmed oral glutathione (500 mg/day) as a skin-lightening agent. Multiple clinical studies support both oral and topical/intradermal use for melanin reduction.

Topical LA inhibits tyrosinase activity and accelerates stratum corneum turnover, both of which reduce cutaneous melanin content. Animal studies show efficient lightening of UV-induced hyperpigmentation. LA's skin-whitening mechanism is distinct from melanocyte depletion—it suppresses active melanin synthesis and enhances desquamation.

Licorice root extract contains glabridin (tyrosinase inhibitor, 16× potency of hydroquinone in vitro) and liquiritin (melanin dispersant), and has the strongest clinical evidence of any East Asian cosmeceutical ingredient for treating hyperpigmentation. It has been used traditionally in East Asian skin brightening.

Luteolin and its derivative luteolin 7-sulfate inhibit CREB and MITF-mediated tyrosinase expression, reducing melanin synthesis in B16F10 cells and primary human epidermal melanocytes. Luteolin is identified in skin disorder reviews as an antimelanogenic flavonoid relevant to hyperpigmentation.

Milk thistle (Silybum marianum) contains silymarin, which inhibits melanogenesis and has been evaluated in four clinical studies for melasma identified in a 2023 systematic meta-analysis. It is recognized as a naturally occurring depigmenting agent in multiple dermatological reviews.

Morus alba is a well-established source of tyrosinase-inhibiting compounds, particularly oxyresveratrol and mulberroside F. In vitro and in vivo evidence demonstrates significant inhibition of melanogenesis. Clinical evidence includes a controlled trial in women with melasma showing reduced melanin content with topical M. alba extract.

Mulberroside A from Morus mulberry bark is a potent tyrosinase inhibitor, showing strong inhibition of both monophenolase and diphenolase activities in vitro with IC50 values in the low micromolar range. It is used as a whitening agent in cosmetics and has been recognized by China's Ministry of Health as a health food active.

Mulberry extract (Morus alba) contains tyrosinase inhibitors including mulberroside A, mulberroside F, and oxyresveratrol. A single RCT using 75% mulberry extract oil showed significant improvement in MASI score, colorimeter measurements, and quality-of-life scores in melasma patients.

N-acetyl glucosamine (NAG) reduces melanin in melanocytes by inhibiting the conversion of pro-tyrosinase to tyrosinase. A clinical study showed 2% NAG reduced facial hyperpigmentation after 8 weeks, and its combination with niacinamide showed superior depigmenting effects in multiple clinical studies.

C. rotundus essential oil (CREO) has been evaluated in multiple published human RCTs for hyperpigmentation. A 2022 RCT in Clinical and Experimental Dermatology (153 participants) compared CREO to hydroquinone and placebo for axillary hyperpigmentation. Another RCT assessed genital hyperpigmentation. CREO showed significant depigmenting efficacy versus placebo.

Oligomeric proanthocyanidins (OPCs), found in grape seed and pine bark, inhibit tyrosinase and scavenge UV-induced free radicals, reducing hyperpigmentation. They are used both orally (for prevention of postprocedural PIH) and topically, and are cited among evidence-based natural depigmenting agents in dermatological reviews.

Oryza sativa bran extracts inhibit melanogenesis via tyrosinase inhibition and downregulation of melanin synthesis genes (TYRP1, MITF). A clinical trial with black rice bran lotion demonstrated skin-brightening efficacy in human participants.

Paeoniflorin inhibits melanin synthesis by suppressing tyrosinase activity and melanogenesis-related signaling. In vitro studies using reconstructed pigmented human epidermis demonstrate significant depigmenting effects comparable to established reference compounds.

Phlebodium decumanum (Polypodium leucotomos) is an oral fern extract with multiple clinical trials demonstrating efficacy as an adjunct treatment for melasma. A randomized, double-blind, placebo-controlled trial published in JAMA Dermatology showed a 28.8% melanin index improvement versus 13.8% for sunscreen alone.

Clinical studies show Pycnogenol (pine bark extract) reduces skin hyperpigmentation by decreasing tyrosinase activity by 66.5% and downregulating other pigmentation-related mediators. A clinical validation study confirmed depigmenting action. MSKCC lists hyperpigmentation improvement as a preliminary clinical finding.

Pine bark extract (Pycnogenol, from Pinus pinaster) contains oligomeric proanthocyanidins that inhibit tyrosinase, reduce UV-induced hyperpigmentation, and have been included in clinical combination formulations for melasma. It is listed among antioxidants reviewed for melasma management.

Procyanidins (oligomeric proanthocyanidins from grape seed and pine bark) are oral and topical agents used to prevent postprocedural hyperpigmentation. They inhibit tyrosinase, scavenge ROS, and have been cited among oral depigmenting agents in dermatological reviews.

Punicalagins are the principal polyphenols of pomegranate and hydrolyze to ellagic acid, providing photoprotection and tyrosinase inhibition relevant to hyperpigmentation. They are identified in reviews of herbal treatments for melasma as examples of UV-protective and antimelanogenic agents.

Resveratrol inhibits tyrosinase activity and suppresses cellular melanin production in vitro, and is used as a coadjuvant in hyperpigmentation treatments. It is listed in multiple dermatological reviews as a naturally occurring depigmenting agent, though it is not potent enough for monotherapy.

Rosehip's high vitamin C content has established use for fading hyperpigmentation, with topical rosehip preparations studied for melasma, post-acne scarring, and uneven skin tone. A 2024 Frontiers in Pharmacology review confirmed that vitamin C from rosehip can decrease acne scar pigmentation and help restore skin complexion.

A. julibrissin extract inhibits tyrosinase activity and melanin production, the principal enzyme and pigment involved in hyperpigmentation. Multiple patents document this activity, and it is used in cosmetic formulations for skin brightening.

Silymarin, the flavonolignan complex from milk thistle, inhibits melanogenesis and has antioxidant properties relevant to hyperpigmentation. A scoping review/meta-analysis (2023) identified four clinical studies on silymarin for melasma, confirming it as one of the antioxidants with documented clinical evidence.

Soy extracts contain serine protease inhibitors (STI/BBI) and isoflavones that inhibit melanosome transfer to keratinocytes and reduce UV-mediated pigmentation. Clinical studies, including a controlled trial in 44 subjects, demonstrated skin-lightening effects. Soy and licorice had the most clinical evidence among East Asian cosmeceutical ingredients reviewed for hyperpigmentation.

Soy isoflavones, particularly genistein and daidzein, inhibit melanogenesis and reduce UV-induced pigmentation. Genistein inhibits melanocyte proliferation and melanosome transfer; clinical evidence supports the overall soy category's efficacy for hyperpigmentation treatment.

Turmeric contains curcumin, which inhibits tyrosinase and melanin synthesis, and has been reviewed in multiple systematic analyses as a natural depigmenting agent for hyperpigmentation and melasma. It also carries traditional use across South Asian and Ayurvedic medicine for skin brightening and evening of skin tone.

Topical niacinamide inhibits the transfer of melanosomes from melanocytes to keratinocytes, the primary cellular mechanism driving skin pigmentation. Multiple clinical trials, including a 12-week randomized double-blind split-face study in 50 women, demonstrated that 5% topical niacinamide significantly reduced hyperpigmented spots compared with vehicle control. Clinical use covers conditions including melasma, post-inflammatory hyperpigmentation, and age spots.

Niacinamide inhibits melanosome transfer from melanocytes to keratinocytes, a unique and well-characterized mechanism of depigmentation. Two separate RCTs demonstrated clinical efficacy in treating facial and axillary hyperpigmentation. It has been combined with tranexamic acid in a prospective, randomized, double-blind trial for facial hyperpigmentation.

Vitamin C (ascorbic acid) inhibits melanogenesis via interaction with copper ions at the tyrosinase active site and reduces oxidized melanin intermediates. A meta-analysis found 7 of 9 placebo-controlled studies showed significant MASI improvement with vitamin C in melasma. It is one of the most clinically studied natural depigmenting agents.

Vitamin E (alpha-tocopherol) causes depigmentation via tyrosinase inhibition, increased intracellular glutathione, and interference with lipid peroxidation of melanocyte membranes. A double-blind study confirmed significant improvement in melasma and pigmented contact dermatitis with topical vitamins E and C combined, with the combination outperforming either vitamin alone.

Moroccan women have traditionally used argan oil to maintain fair skin complexion. A 2013 cell culture study (PMC3723062) showed argan oil modulated MITF and inhibited tyrosinase and dopachrome tautomerase expression in B16 melanoma cells, reducing melanin synthesis. No human clinical trials exist.

Amla's high vitamin C content and tannins are known inhibitors of melanin synthesis via tyrosinase inhibition in preclinical studies. Traditional cosmetic use in South Asia for skin brightening and reducing dark spots is extensively documented.

R. cordifolia is classified in Ayurveda as a 'Varnya' (complexion-enhancing) herb and as 'Varnakrut' (improves skin complexion). A paste made from the root with honey is traditionally applied to remove brown spots, freckles, and skin discoloration. Anthraquinone constituents are proposed to inhibit melanin production, though no controlled clinical studies have confirmed melanin inhibition in humans.

Shea butter is traditionally used in Sub-Saharan Africa to even skin tone and reduce age spots or post-inflammatory hyperpigmentation. The anti-inflammatory triterpenes may reduce the inflammatory cascade that drives post-inflammatory pigment deposition. No controlled human clinical trials specifically measuring hyperpigmentation endpoints with shea butter alone have been identified.