BioTechUSA Zinc Duo is a zinc/mineral supplement. The official product page says it provides 25 mg of zinc per daily dose, from two forms: zinc gluconate (20 mg) and zinc bisglycinate (5 mg). What zinc does Zinc is involved in: 🛡️ Normal immune-system function 🧬 Protein synthesis and cell processes 💇 Maintaining normal hair, skin and nails ⚡ Normal metabolism 🧪 Maintaining normal testosterone levels when zinc status is adequate