What warning label should be used with antioxidants and chelating agents?

• A. Tightly close
• B. Keep away from heat
• C. Use only as directed
• D. Store in light-resistant container

Answer: (A)

The key idea is protecting sensitive ingredients from air and moisture to preserve stability. Antioxidants can oxidize or degrade when exposed to oxygen, and chelating agents may lose effectiveness if humidity or other storage conditions promote unwanted reactions. Keeping the container tightly closed minimizes air and moisture ingress, helping maintain potency and shelf life.

While other labels like keeping away from heat or storing in a light-resistant container are important for some substances, they aren’t as universally applicable to all antioxidants and chelating agents. Use only as directed speaks to dosing, not storage. If a product is specifically light-sensitive, a separate label would also be used, but the general precaution to keep the container tightly closed best addresses stability for these types.