How It Works
Cofactor for 5α-reductase (T → DHT conversion). Required for androgen receptor function. Component of Cu/Zn-SOD (antioxidant). Zinc finger proteins in DNA repair. Inhibits aromatase (reduces T → estradiol conversion at high doses).
Dosage & Timing
Dosage Guide
Daily Dose15-40 mg
TimingWith food (reduces nausea). Avoid with high-calcium meals. Evening preferred by some (sleep effect).
BioavailabilityPicolinate: ~60%. Glycinate: ~55%. Citrate: ~50%. Oxide: ~20% (avoid). Phytates (grains/legumes) reduce absorption ~50%. Take away from high-phytate meals.
Optimal Timing
With food to prevent nausea. Avoid with high-calcium meals. Evening may improve sleep quality. Separate from iron supplements by 2+ hours.
Blood Markers to Monitor
- Serum Zinc
- Copper (monitor for depletion with long-term zinc)
- Alkaline Phosphatase (zinc-dependent enzyme)
Best Forms (Ranked)
Zinc Picolinate — ★★★★★
Excellent absorption. Well-tolerated. Most researched for T support.
Zinc Glycinate — ★★★★★
Gentle on stomach. Good absorption. Chelated form.
Zinc Citrate — ★★★★☆
Good absorption. Slightly more GI effects than glycinate/picolinate.
Zinc Oxide — ★☆☆☆☆
Poor absorption. Cheap but ineffective. Avoid for supplementation (good for sunscreen though).
Benefits
- Testosterone increase (if deficient)
- Reduced cold duration (lozenges at onset)
- Acne reduction (anti-inflammatory, anti-androgenic)
- Improved sperm quality
- Wound healing
- Reduced inflammation (CRP reduction)
Side Effects
- Nausea on empty stomach
- Copper depletion with long-term high dose (>50mg/d)
- Reduced HDL at very high doses
- Metallic taste
- Loss of smell (rare, with zinc nasal sprays only)
✅ Good For
- Athletes (sweat losses, immune stress)
- Men with low T symptoms
- Acne-prone individuals
- Frequent sickness
- Vegetarians/vegans (phytates, lower intake)
⚠️ Skip If
- Those with Wilson disease
- Already supplementing high-dose zinc (check total intake)