NOW Zinc Picolinate 50 mg

Our assessment

The evidence shows that zinc is a vital mineral for immune function, but the 50 mg dose in this product is significantly above the tolerable upper intake level of 40 mg per day for adults. You should be cautious with long-term use at this dosage [NIH ODS].

How it works

Zinc supports your immune system by helping immune cells develop and communicate. It also plays a role in cell growth, DNA synthesis, and wound healing. The picolinate form is designed to be easily absorbed by your body [NIH ODS].

Safety profile

FDA received 592059 total adverse event reports across all products. For zinc, high doses (over 40 mg daily) can cause nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches. Chronic high intake can lead to copper deficiency and reduced immune function [FDA data] [NIH ODS].

Our recommendation

You should not take this 50 mg dose daily unless directed by a physician for a specific, short-term condition. A safer daily dose is 8–11 mg for most adults. Consider a lower-dose zinc supplement or take this product only every other day to avoid exceeding safe limits [NIH ODS].

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide