Amazon.com: Vitamin B12 1000 Mcg (B12 Vitamin As Cyanocobalamin) Sustained Release Premium Non GMO Tablets - Supports Nervous System, Healthy Brain Function and Energy Production – 250 Count : Health & Household
Amazon.com: Nature Made Vitamin B12 1000 mcg, Dietary Supplement For Energy Metabolism Support, 160 Time Release Tablets, 160 Day Supply
Vitamin B-12 1000 mcg (60 tablets) B12 Supplement | Country Life Vitamins