Zinc
Zinc (Picolinate/Bisglycinate)
Zinc is an essential trace mineral critical for immune function, protein synthesis, wound healing, DNA synthesis, and cellular division. It is commonly supplemented to correct deficiency states and is widely used to support immune health, testosterone production, skin integrity, and cognitive function. Zinc picolinate and bisglycinate are chelated forms with superior bioavailability compared to zinc oxide or sulfate.
Mechanism of Action
Zinc acts as a cofactor for over 300 enzymes and more than 1,000 transcription factors, playing structural and catalytic roles across virtually every metabolic pathway. It modulates immune function by regulating T-cell development and cytokine signaling, and it acts as an intracellular signaling molecule influencing insulin receptor kinase activity and androgen receptor function. Zinc also functions as an antioxidant cofactor within superoxide dismutase (Cu/Zn-SOD) and inhibits viral replication by blocking RNA-dependent RNA polymerase.
Evidence by Health Goal(18 goals)
Dosing Protocols
With a small meal to reduce gastrointestinal irritation; avoid taking with high-phytate foods like whole grains or legumes which impair absorption
Therapeutic doses for deficiency correction range up to 40mg/day (the tolerable upper intake level for adults). Long-term use above 25mg/day should include 1-2mg copper supplementation to prevent copper depletion. Picolinate and bisglycinate forms provide approximately 20-30% better absorption than zinc oxide.
Safety & Side Effects
Zinc is very safe within the recommended dietary allowance of 8-11mg/day and even at supplemental doses up to 40mg/day when copper intake is maintained; however, chronic supplementation above 40mg/day carries meaningful risk of copper deficiency-induced anemia and neurological complications. It is not a controlled substance and is available over-the-counter worldwide.
Possible Side Effects
- !Nausea and gastric irritation when taken on an empty stomach
- !Metallic taste in the mouth
- !Copper deficiency with chronic high-dose use (>40mg/day elemental zinc)
- !Reduced iron absorption with concurrent intake
- !Headache at doses approaching or exceeding the tolerable upper limit
- !Vomiting at acute high doses (>150mg elemental zinc)
- !Anemia and immune suppression secondary to copper depletion from prolonged excessive use
Interactions
- -Competes with copper absorption - long-term use above 25mg/day necessitates co-supplementation with 1-2mg copper
- -Reduces absorption of fluoroquinolone and tetracycline antibiotics - separate administration by at least 2 hours
- -Inhibits absorption of iron supplements - administer at different times of day
- -May reduce absorption of certain bisphosphonate drugs (e.g., alendronate) - take bisphosphonates 2+ hours before zinc
- -High-phytate foods (whole grains, legumes) and calcium supplements can significantly reduce zinc bioavailability when co-ingested
Cost & Where to Buy
Zinc oxide is the cheapest form but poorly absorbed; quality chelated forms (picolinate, bisglycinate) from reputable brands typically cost $12-25/month. Bulk generic options lower cost significantly.
Search on Amazon