Maybe it's because it's so affordable. Zinc (from zinc citrate). Supports immune function. Ingredients Microcrystalline cellulose (plant fiber), gelatin, magnesium stearate, silica. Do not exceed the stated dosage.
Swanson Zinc Citrate 50mg 60 Capsules, Hair, Skin & Nails, Immune System Support
Swanson Zinc Gluconate 30mg 250 Tablets, Hair Skin & Nails, Immune System
Swanson Albion Zinc 30mg 90 Capsules, Hair, Skin & Nails, Immune System Support
Swanson Zinc Picolinate 22 mg 60 Capsules, Hair, Skin & Nails, Immune System
Biovea Zinc 15mg 120 Vegetarian Capsules, Hair, Skin & Nails, Immune System
RAW POWDERS Selenium 200mcg 60 Capsules Hair Skin Nails Immune System Health
