Zinc
Zinc is an essential mineral involved in hundreds of enzymatic reactions. Huberman discusses its role in immune function, testosterone production, and why deficiency is common.
What Zinc Does
| System | Role |
|---|---|
| Immune | Essential for immune cell function |
| Hormones | Required for testosterone synthesis |
| Brain | Neurotransmitter function |
| Wound healing | Tissue repair |
| Taste/smell | Sensory function |
| DNA synthesis | Cell division |
Zinc is a cofactor for 300+ enzymes—it’s involved in nearly everything.
Deficiency Signs
| Sign | Related To |
|---|---|
| Frequent illness | Immune dysfunction |
| Low testosterone | Hormone synthesis |
| Slow wound healing | Tissue repair |
| Hair loss | Multiple mechanisms |
| Loss of taste/smell | Sensory function |
| Brain fog | Neurotransmitter issues |
Deficiency is relatively common, especially in:
- Athletes (lost in sweat)
- Vegetarians/vegans (plant sources less bioavailable)
- Elderly
- Those with GI issues
Zinc and Testosterone
Zinc is required for testosterone synthesis:
- Deficient men have lower T
- Supplementation restores T if deficient
- Won’t boost T if already sufficient
- Part of male fertility support
Zinc and Immunity
During illness:
- Zinc lozenges may reduce cold duration
- Must be taken early (within 24 hours of symptoms)
- High doses for short periods
- Not for prolonged use
Food Sources
| Source | Zinc Content |
|---|---|
| Oysters | Highest |
| Beef | High |
| Pumpkin seeds | Moderate |
| Lentils | Moderate (less bioavailable) |
| Eggs | Moderate |
Animal sources are more bioavailable than plant sources.
Supplementation
Forms
| Form | Notes |
|---|---|
| Zinc picolinate | Well absorbed |
| Zinc citrate | Good absorption |
| Zinc gluconate | Common, moderate absorption |
| Zinc oxide | Poor absorption |
Dosing
- RDA: 11mg (men), 8mg (women)
- Supplement range: 15-30mg daily
- Upper limit: 40mg daily (chronic)
- Acute illness: Higher doses short-term
The Copper Balance
High zinc can deplete copper:
- Long-term high-dose zinc supplementation
- Can cause copper deficiency
- Take with copper or cycle zinc
- Usually not an issue at moderate doses
Timing
- Take with food (reduces nausea)
- Can compete with other minerals if taken together
- Some separate from calcium supplements
Testing
Serum zinc:
- Measures blood levels
- Doesn’t perfectly reflect tissue stores
- Low normal may still indicate insufficiency
- Consider in context of symptoms
Related Pages
“Zinc is involved in so many processes that deficiency affects multiple systems. Athletes, vegetarians, and those under high stress should pay particular attention to zinc status.” — Andrew Huberman