A form of vitamin B12
Adenosylcobalamin supplements
223 vitamin B12 products in the NIH label database list vitamin B12 as adenosylcobalamin (2% of the 14,774 vitamin B12 products); their median is 281.5 mcg of vitamin B12 per serving, against 36 mcg across all vitamin B12 products; the 41 whose only supplement ingredient is vitamin B12 list a median of 2,500 mcg (DSLD version 9.4.0, January 2026).
How does adenosylcobalamin compare with the other forms?
The median amount of vitamin B12 per serving in products naming each form; the count in brackets. The amount is the vitamin B12 the label gives, as printed.
Median vitamin B12 per serving by form
Source: Supplement Facts rows and their forms, NIH ODS Dietary Supplement Label Database version 9.4.0, current labels.
- Products
- 223172 on the market
- Median vitamin B12 per serving
- 281.5 mcgall vitamin B12 products: 36 mcg
- Share of vitamin B12 products
- 2%223 of 14,774
What else do these products contain?
| Ingredient | Share of these products | Median here | Median, all products |
|---|---|---|---|
| Folate | 77% | 400 mcg | 400 mcg |
| Vitamin B6 | 71% | 20 mg | 6 mg |
| Riboflavin | 65% | 10 mg | 4 mg |
| Niacin | 63% | 38.15 mg | 20 mg |
| Pantothenic Acid (Vitamin B5) | 61% | 50 mg | 12 mg |
| Thiamin | 61% | 25 mg | 5 mg |
| Biotin | 58% | 300 mcg | 200 mcg |
| Vitamin C | 47% | 200 mg | 100 mg |
| Vitamin E | 46% | 150 IU | 30 IU |
| Selenium | 44% | 100 mcg | 55 mcg |
Which products are they?
60 of the 223 (on-market products first, the newest label first), ordered by the amount of vitamin B12 per serving, largest first; an amount that looks like a slip or a compound's weight comes last, marked.
- Vitamin B12 5,000 mcgGlobal Healing5,000 mcg
- Active B12 5000Seeking Health5,000 mcg
- Liquid B-12 5,000 mcgProtocol For Life Balance5,000 mcg
- Adeno B12 3,000 mcgSeeking Health3,000 mcg
- hydro B12Good State3,000 mcg
- B12Good State2,500 mcg
- Bump BDCenturion Health2,000 mcg
- Hydrox-Adeno B12 2,000 mcgSeeking Health2,000 mcg
- Vitamin B12Carotec2,000 mcg
- Instant Energy B12NOW2,000 mcg
- Activated B12 Complex Natural Cherry FlavorSwanson2,000 mcg
- Adenosyl/Hydroxy B12Pure Encapsulations2,000 mcg
- BumP DHACenturion1,000 mcg
- Bump MiniCenturion Health1,000 mcg
- Bump MSCenturion Health1,000 mcg
- B12 EliteLife Extension1,000 mcg
- Active B12 1000Seeking Health1,000 mcg
- B-12 Adenosylcobalamin 1000 mcg StrawberryKAL1,000 mcg
- Qultured B12Quantum Nutrition Labs1,000 mcg
- DibencozideEcological Formulas1,000 mcg
- PureResponse MultivitaminPure Encapsulations1,000 mcg
- Adenosyl/Hydroxy B12 LiquidPure Encapsulations1,000 mcg
- Amino-NRPure Encapsulations1,000 mcg
- B6 ComplexPure Encapsulations1,000 mcg
- HomocysteX PlusSeeking Health1,000 mcg
- GlutenAssure MultivitaminPure Encapsulations840 mcg
- Active Methylated B ComplexApproved Science500 mcg
- Coenzyme B-ComplexCountry Life500 mcg
- Dopamine AdvantageLife Extension500 mcg
- B-ComplexHealthy Origins500 mcg
- Max Energy BsQuantum Nutrition Labs400 mcg
- Premier Complete B CapsulesPremier Research Labs400 mcg
- Daily Essential Nutrients Iron & Copper FreeHardy Nutritionals300 mcg
- Daily Essential Nutrients with added VitamersHardy Nutritionals300 mcg
- Max Energy Bs FermentedQuantum Nutrition Labs263 mcg
- Qultured Max Stress BQuantum Nutrition Labs263 mcg
- Max B-NDPremier Research Labs263 mcg
- B Complex Neuro FactorsProtocol For Life Balance250 mcg
- Optimal MultivitaminSeeking Health250 mcg
- Co-Enzyme B-ComplexNOW250 mcg
- Phyto B ComplexEnergetix240 mcg
- Post-Workout Recovery ChocolateAdvoCare100 mcg
- B Complex MFSeeking Health50 mcg
- Premier Multi-VitaminPremier Research Labs50 mcg
- Quantum Plant Multi-VitaminQuantum Nutrition Labs50 mcg
- B Complex PlusSeeking Health50 mcg
- Maxum Multi ViteGenestra Brands30 mcg
- Multivitamin One MFSeeking Health25 mcg
- Total Balance Women's PremiumXtendlife24 mcg
- Multi-XtraXtendlife24 mcg
- Total Balance Men'sXtendlife24 mcg
- Total Balance Men's PremiumXtendlife24 mcg
- Total Balance Women'sXtendlife24 mcg
- Serene SaffronXtendlife24 mcg
- Nr6Xtendlife24 mcg
- Optimal Multivitamin ChewableSeeking Health20 mcg
- Vegan Health Daily Oral SprayBetterYou6 mcg
- Think SharpXtendlife2.4 mcg
- Total Balance Children'sXtendlife2 mcg
- VasQFlowXtendlife1.2 mcg
Source: NIH ODS Dietary Supplement Label Database version 9.4.0; the form each label names for its row. Daily Values: the FDA's Daily Value page.
Which brands make them?
Seeking Health (27), Country Life (16), Xtendlife (16), NutriGold (12), Pure Encapsulations (11), Douglas Laboratories (10), ProThera (9), Hardy Nutritionals (7), MHP Maximum Human Performance (5), NOW (5).