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Zinc
Involved in 300+ enzymatic reactions — supports immune defense, testosterone production, wound healing, and sleep quality.
What the evidence says
Zinc appears to help in 18 of 24 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1996–2026 with a typical study size of 1,076 participants.
Based on 43 studies · 31 meta-analyses · 2 RCTs · 488,790 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Zinc.
Zinc has an evidence score of 9/10 — very strong evidence based on 43 indexed studies, including 36 meta-analyses. Involved in 300+ enzymatic reactions — supports immune defense, testosterone production, wound healing, and sleep quality.
The commonly studied dose of Zinc is 15-30mg daily. Research points to an estimated optimal dose around 20mg, with a minimum effective dose near 8mg. Individual response varies — start low and adjust.
The best time to take Zinc is in the evening. Taking it with food is preferred. Zinc is an essential trace mineral involved in over 300 enzymatic reactions including immune function, DNA synthesis, wound healing, and testosterone production.
Last reviewed May 2026 · evidence from 40 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Zinc is an essential trace mineral involved in over 300 enzymatic reactions. It's crucial for immune function, protein synthesis, wound healing, and DNA synthesis. Deficiency is common, especially in athletes, vegetarians, and older adults. Proper zinc status supports testosterone, immune health, and sleep quality.
Essential for immune cell development and function
Supports testosterone and growth hormone
Required for tissue repair and growth
How Zinc works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
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15-30mg daily
Take with food
| Form | Type |
|---|---|
| 💊Zinc picolinate or zinc citrate | Recommended |
| 💊Zinc gluconate | Alternative |
| 💊Zinc monomethionine (OptiZinc) | Alternative |
Picolinate and citrate are well-absorbed. Avoid zinc oxide (poor absorption). OptiZinc includes copper to prevent depletion.
Minimum: 4 weeks
Optimal: 8 weeks
Cycling: Long-term use >40mg/day can deplete copper. Cycle or use zinc with copper (10:1 ratio).
Note: Take with food to prevent nausea. Avoid taking with calcium, iron, or copper supplements (separate by 2+ hours). Evening may support sleep.
Based on meta-analyses showing reduced respiratory tract infections and improved immune markers (CD3/CD4). Effects primarily in deficient individuals. Take with food to reduce nausea risk.
Faster recovery from illness, fewer infections
Better sleep quality when correcting deficiency
Maintains healthy testosterone when deficient
Can cause nausea if taken without food
RDA is 11-13mg; supplementation may be needed with medical supervision
May need 50% more due to reduced absorption from plant sources
Often depleted through sweat; supplementation commonly beneficial
Reduces antibiotic absorption; take 2+ hours apart
Reduces drug absorption
Some diuretics increase zinc excretion
Tip: Always take with food
Tip: Try different form
Tip: Don't exceed 40mg/day long-term; add copper
Both often deficient; support sleep and recovery
Comprehensive mineral support for sleep and recovery
Both support immune function
Enhanced immune system support
Both effective for colds
Comprehensive acute cold protocol
Zinc supports immune cells; beta-glucan activates them
Complete immune support
Zinc also supports hair and nail health
Multi-nutrient hair/nail support
Must be balanced; zinc depletes copper
Proper mineral balance
Both have evidence for cold duration
Enhanced cold-fighting protocol
Both support immune function during illness
Enhanced cold/flu recovery support
Both support testosterone production
Comprehensive testosterone support
Both support gut barrier function
Enhanced intestinal integrity
Both support immune function and cold sore prevention
Enhanced immune and antiviral support
Quercetin is a zinc ionophore, improving zinc uptake
Enhanced immune support, especially for viral infections
Prostate has high zinc requirements
Comprehensive prostate nutrition
Zinc is essential for testosterone production
Comprehensive testosterone support
Zinc is required for vitamin A metabolism
Enhanced vitamin A utilization
Both support immune function through different pathways
Enhanced immune support, especially during cold season
Lactoferrin with zinc and vitamin E demonstrated improved acne outcomes in RCTs, combining antimicrobial, anti-inflammatory, and antioxidant mechanisms.
Synergistic reduction in inflammatory acne lesions
PSO naturally contains zinc; additional zinc supplementation supports 5-alpha reductase modulation and prostate health synergistically
Comprehensive prostate and hormonal health support
Zinc is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are nausea, metallic taste, copper deficiency (long-term high dose). Use caution if any of these apply to you: Copper deficiency (zinc depletes copper).
Ashwagandha
Likely helpsReduces cortisol and anxiety while improving sleep quality and physical recovery in stressed adults.
Severely reduced antibiotic effectiveness
Severely reduced antibiotic effectiveness
Reduced antibiotic effectiveness
Significantly reduced antibiotic effectiveness