Zinc

Zinc is an essential mineral involved in immune function and wound healing. Some small trials in people with PCOS have reported changes in hair growth or hormone and insulin measures, but results are inconsistent and evidence of benefit is limited. Too much zinc over time can cause copper deficiency.

People with confirmed low zinc or a restrictive diet, or who are following a clinician's advice. Whether it suits you depends on your health, medicines and test results — ask a clinician.

Studies have used about 25–50 mg daily. The NIH upper limit for adults is 40 mg per day from all sources; higher amounts should only be used under medical supervision. Doses vary by product and person; this is not personal medical advice.

Studies measured effects over about 8–12 weeks.

Nausea, stomach upset and metallic taste. Long-term high doses can lower copper levels and cause anemia and nerve problems.

Do not exceed 40 mg per day from all sources without medical supervision. Take with food if it upsets your stomach.

Evidence level (our editorial summary, not a formal grading): Limited.

Pregnancy & breastfeeding: Zinc is part of normal prenatal nutrition (the recommended daily amount in pregnancy is 11 mg); do not exceed the upper limit.

Medication interactions: Zinc can reduce absorption of some antibiotics (quinolones, tetracyclines) and of penicillamine; iron and calcium can reduce zinc absorption.

Talk to a healthcare professional before use if you are pregnant, breastfeeding, planning pregnancy, have a medical condition, take any medicine, or are scheduled for surgery. Dietary supplements are not approved by the FDA for safety or effectiveness before they are sold, and quality varies between products.

Reliable sources to check: NIH Office of Dietary Supplements fact sheets · NCCIH Herbs at a Glance · MedlinePlus Herbs & Supplements · FDA — Dietary Supplements