| Vitamin B12 500 mcg | AN Amazing Nutrition Amazing Formulas | 500 mcg | United States | 片剂 |
| Organic Super Greens Energizer | Ancient Nutrition | 12 mcg | United States | 片剂 |
| Vitamin B-12 | Ancient Nutrition | 20 mcg | United States | 胶囊 |
| Methyl B12 - 15 mg | AOR Advanced Orthomolecular Research Advanced | 135,000 mcg | United States | 含片 |
| Methyl B12 - 5 mg | AOR Advanced Orthomolecular Research Premium | 5,000 mcg | United States | 含片 |
| Nutrisorb Methyl B12 | BioCare | 500 mcg | United States | 液体 |
| Nutrisorb Vitamin B12 | BioCare | 50 mcg | United States | 液体 |
| Vitamin B12 | BioCare | 500 mcg | United States | 胶囊 |
| B12 | Bioclinic Naturals | 1,000 mcg | United States | 含片 |
| Vitamin B12 Methylcobalamin 1000 mcg | BIOVEA | 1,000 mcg | United States | 片剂 |
| Vitamin B12 5000 mcg Raspberry Flavor | Bluebonnet EarthSweet Chewables | 5,000 mcg | United States | 片剂 |
| Liquid Vitamin B12 2500 Wild Tart Cherry | Brain Forza | 2,500 mcg | United States | 液体 |
| Vitamin B12 1% (Cyanocobalamin) 1000 mcg | BulkSupplements.com | 1,000 mcg | United States | 胶囊 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 其他剂型 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 粉剂 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 粉剂 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 粉剂 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 其他剂型 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 粉剂 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 粉剂 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 其他剂型 |
| Vitamin B12 1% (Methylcobalamin) | BulkSupplements.com | 200 mcg | United States | 粉剂 |
| Vitamin B12 1000 mcg Softgels | BulkSupplements.com | 1,000 mcg | United States | 胶囊 |
| Vitamin B12 Softgels 1000 mcg | BulkSupplements.com | 1,000 mcg | United States | 胶囊 |
| Vitamin B12 Softgels 5000 mcg | BulkSupplements.com | 5,000 mcg | United States | 胶囊 |
| Vitamin B12 | Carotec | 1,000 mcg | United States | 含片 |
| Vitamin B12 | Cooper Complete | 1,000 mcg | United States | 液体 |
| Vitamin B12 1000 mcg | Country Life | 1,000 mcg | United States | 片剂 |
| Vitamin B12 500 mcg | Country Life | 500 mcg | United States | 片剂 |
| Fully Active B12 | Doctor's Best | 1,500 mcg | United States | 胶囊 |
| Vitamin B12 | Douglas Laboratories | 2,500 mcg | United States | 片剂 |
| Vitamin B12 | Douglas Laboratories | 2,500 mcg | United States | 含片 |
| Vitamin B12 Cherry Flavored | DrFormulas | 3,000 mcg | United States | 片剂 |
| B12 Infusion | Enzymatic Therapy | 1,000 mcg | United States | 片剂 |
| Vitamin B12 500 mcg | Exchange Select | 500 mcg | United States | 片剂 |
| Natural Vitamin B12 1000 mcg | Exchange Select X | 1,000 mcg | United States | 片剂 |
| Vitamin B12 5000 mcg | Global Healing | 5,000 mcg | United States | 液体 |
| B12 | Good State | 2,500 mcg | United States | 液体 |
| Vitamin B12 Raspberry Flavor | Gummiology | 3,000 mcg | United States | 软糖 |
| B12 2500 mcg | International Vitamin Corporation | 2,500 mcg | United States | 片剂 |
| Vegan B12 | Live Conscious | 5,000 mcg | United States | 液体 |
| Vegan B12 | Live Conscious | 5,000 mcg | United States | 液体 |
| Liposomal Vitamin B12 | NanoNutra | 1,000 mcg | United States | 液体 |
| Energy B12 Adult Gummies 1000 mcg | Nature Made | 1,000 mcg | United States | 软糖 |
| Vitamin B12 1000 mcg | Nature Made | 1,000 mcg | United States | 胶囊 |
| Vitamin B12 1000 mcg | Nature Made | 1,000 mcg | United States | 胶囊 |
| Vitamin B12 1000 mcg | Nature Made | 1,000 mcg | United States | 胶囊 |
| Vitamin B12 1000 mcg Cherry Flavor | Nature Made | 1,000 mcg | United States | 含片 |
| Vitamin B12 3000 mcg | Nature Made | 3,000 mcg | United States | 胶囊 |
| Vitamin B12 3000 mcg Cherry Flavor | Nature Made | 3,000 mcg | United States | 含片 |
| Vitamin B12 3000 mcg Cherry Flavor | Nature Made | 3,000 mcg | United States | 含片 |
| Vitamin B12 3000 mcg Cherry Flavor | Nature Made | 3,000 mcg | United States | 含片 |
| Vitamin B12 1000 mcg | Nature's Plus | 1,000 mcg | United States | 片剂 |
| B-12 1,000 mcg | Nature's Truth | 1,000 mcg | United States | 片剂 |
| B-12 1,000 mg | Nature's Truth | 1,000 mcg | United States | 片剂 |
| B-12 500 mcg | Nature's Truth | 2,500 mcg | United States | 片剂 |
| Fast Dissolve B-12 1,000 mg Natural Berry Flavor | Nature's Truth | 1,000 mcg | United States | 片剂 |
| Fast Dissolve B-12 5,000 mg Natural Berry Flavor | Nature's Truth | 5,000 mcg | United States | 片剂 |
| Fast Dissolve B-12 6,000 mcg Natural Berry Flavor | Nature's Truth | 6,000 mcg | United States | 片剂 |
| Timed Release B-12 1,000 mcg | Nature's Truth | 1,000 mcg | United States | 片剂 |