What Works Skin — Independent · Evidence-First · Ad-FreeIssue 014 · 20 April 2026 · Next: 04 Maywhatworksskin.com
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Supplement · Photoprotection · Carotenoids

P. 11 · BRIEF

Carotenoids.

Diet first. Supplement secondary.

Beta-carotene and lycopene are real molecules with real photoprotective signal — primarily from dietary intake. Supplementation contributes a modest, slow extension to MED. Useful adjunct; not a sunscreen substitute, not a transformative addition.

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— § 02

What the literature shows.

MED extension over 8–12 weeks
Meta-analyses

Statistically significant but modest. The literature supports an SPF-equivalent of perhaps 2–3 — meaningful only as adjunct.

55%
Erythema reduction post-UV
Small RCTs

Real, modest. Most consistent in fair-skinned populations with high baseline UV exposure.

50%
Melasma / pigment work
—

Not the indication. Use targeted oral or topical pigmentation work instead.

15%
Lung cancer in heavy smokers
Beta-carotene RCTs

The CARET and ATBC trials showed increased lung cancer risk in smokers on high-dose beta-carotene. Not for current smokers.

Caution
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— § 03

Forms and bioavailability.

Mixed carotenoid blend (10 mg)

Absorption · Modest

Default for skin endpoints. Pair with dietary intake.

Lycopene 25 mg (tomato-derived)

Absorption · Good

Best-studied carotenoid for skin. Tomato paste is dietary alternative.

Beta-carotene isolate 25 mg

Absorption · Good

Avoid in current smokers. Mixed carotenoids preferred for safety.

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Bottom line

A small, slow contributor. Defensible for fair-skinned, high-UV-exposure individuals. Skip if you are a current smoker. Diet outperforms supplement for most people.

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— § 04

Frequently asked.

Will this replace sunscreen?

No. The MED extension translates to an effective SPF of roughly 2–3, against products that deliver SPF 30–50. Use as adjunct on top of daily mineral SPF, never as substitute.

Diet vs supplement?

Tomato paste, watermelon, carrots, sweet potatoes, and red bell peppers all deliver lycopene and beta-carotene at meaningful doses. We prefer dietary sources where realistic; supplementation is reasonable when diet is constrained.

Will it turn my skin orange?

At 10–15 mg/d, no. At higher doses (25 mg+), carotenodermia (yellow-orange palms and soles) is reversible and harmless but cosmetically obvious. Cap at 15 mg if you want to avoid the conversation.

How long until effect?

8–12 weeks at minimum. Carotenoids accumulate in the stratum corneum slowly. Stop the supplement and the photoprotective contribution fades over 4–6 weeks.