Zinc — Supplement brief — What Works Skin

— § 01

The brief.

Class: Trace mineral
Form: Picolinate · gluconate · citrate
Dose: 15 – 30 mg/d with food
Timeline: 8 – 12 weeks for acne
Cap: ≤ 40 mg/d total dietary + supplement
Pregnancy: Safe at RDA (11 mg/d)
Reviewer: Dr. Paul · 18-Apr-2026

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— § 02

What the literature shows.

Inflammatory acne

RCTs vs placebo, 30 mg/d

Modest reduction in lesion count over 12 weeks. Adjunct, not monotherapy.

65%

Acne vs minocycline

Comparator trials

Less effective than oral antibiotics, with cleaner side-effect profile.

55%

Hair shedding (with deficiency)

Observational + small RCTs

Real benefit when zinc is genuinely low. Test before supplementing.

70%

General 'glow' / immunity

—

Marketing only. Treats deficiency, not vague complaints.

20%

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— § 03

Forms and bioavailability.

Zinc picolinate

Absorption · High

Best-tolerated form. The default for skin endpoints.

Zinc gluconate

Absorption · Good

Cheaper, well-studied for acne. Often used in older trials.

Zinc citrate

Absorption · Good

Pleasant taste; good for lozenges. Adequate for skin.

Zinc sulfate

Absorption · Moderate

Highest GI upset risk. Older formulations only.

Zinc oxide (oral)

Absorption · Poor

Absorption barely meaningful. Skip.

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— § 04

Frequently asked.

How much should I take?

15–30 mg/d with food, ideally not on an empty stomach. Cap at 40 mg/d total dietary + supplement to avoid copper depletion. For acne, the published RCTs use 30 mg/d for 12 weeks.

Why does it upset my stomach?

Zinc is gastric-irritant on its own. Always take with a meal that contains some fat. If still problematic, switch from sulfate to picolinate or citrate, and split the dose AM/PM.

Will it interact with antibiotics?

Yes. Zinc reduces absorption of tetracyclines (including minocycline and doxycycline used for acne) and quinolones. Separate by at least two hours.

When can I expect to see acne improvement?

Eight to twelve weeks at minimum. Zinc is a slow, modest player — useful as part of a stack alongside topical retinoids and BPO, rarely effective on its own for moderate-severe presentations.