GLOSSARY

Zinc Reference Table

US/Canadian adult mineral references, generally age 19-50; adult values are male / female. Magnesium values shown are age 19-30.

Zinc is an essential trace element for enzymes and cellular synthesis, distinct from unrestricted supplementation for muscle growth.

Zinc supports enzymes, DNA and protein synthesis, tissue repair and immunity; these roles do not promise unlimited testosterone or muscle gains. Meat, seafood, dairy, legumes and nuts provide different sources. Adequacy relates to sufficient energy and variety. Plant-based diets warrant attention to source amounts and preparation, but plant origin alone establishes neither deficiency nor a need for therapeutic doses.

Intestinal absorption and secretion regulate zinc; fractional uptake may fall as intake rises. Phytate can limit availability, while soaking or fermentation can alter some foods. Effects depend on the actual food and preparation, not one fixed percentage for all meals. Concentrated supplements make competition more relevant; removing all whole grains and legumes is not a general strategy for improving zinc nutrition.

Serum or plasma zinc varies with time, fasting, inflammation and specimen quality; a low result does not always establish depleted total stores. Deficiency can affect healing, taste or immunity, but these findings are nonspecific. Recent illness matters for an athlete's sample. Diagnosis integrates evidence rather than relying on one number or the claims of a sleep or recovery supplement.