Zinc

Evidence: ★★★★☆ · Status: OTC Supplement

💡 Did you know? Take too much zinc for months and you can quietly become copper-deficient — the two minerals fight for the same doorway into your body.

In plain English

A mineral your testosterone factory can't run without. Sweat it out training, and hormones drop. Fixing a deficiency reliably raises testosterone; taking extra when you're already fine does nothing.

How it works

Cofactor in 100+ enzymes and required by Leydig cells for testosterone synthesis; a structural ion in "zinc-finger" transcription factors. Lost in sweat, so athletes are frequently deficient — and deficiency directly suppresses testosterone.

Molecular target & official sources

SLC39A / ZIP zinc transporters (NCBI Gene, SLC39A4) · Zinc (PubChem CID 23994)

Protocol

15–30 mg with food (not empty stomach). Add 1–2 mg copper if used for months.

Bottom line

Valuable *if deficient*, which many athletes are.

Helps with: Recover Faster · Hormones & Testosterone · Immunity

Stacks with

Copper (~1 mg per 15 mg zinc) to prevent depletion.

Shares a pathway — often paired with: Omega-3 (EPA/DHA), Vitamin D3 (+ K2), Testosterone (TRT), Finasteride / Dutasteride.

Avoid combining with

Long-term high-dose zinc depletes copper; don’t take with calcium, iron or coffee (they compete for absorption).

Availability & where to buy

Available over the counter. Widely available OTC — e.g. iHerb (ships worldwide); in Singapore also Guardian, Watsons, GNC, Shopee / Lazada. Look for a third-party-tested / GMP mark and check the dose per serving. Cheap — ~S$10–20/month.

How it works: the Nuclear receptors pathway →

Used in these protocols

Compare Zinc

Common questions

Does Zinc actually work?

Human-evidence rating: 4 of 5. Valuable if deficient, which many athletes are.

How do you take Zinc?

15–30 mg with food (not empty stomach). Add 1–2 mg copper if used for months.

Is Zinc legal or approved?

Regulatory status: OTC Supplement.