Supplement·Interactions·Reviewed June 9, 2026
Methylcobalamin interactions.
Methylcobalamin has 12 documented interactions in the NutriStack database: 1 that need timing or caution and 11 that work synergistically. The full list, with what each pairing does, is below.
Methylcobalamin at a glance.
A quick, data-grounded summary. The full table is below.
Methylcobalamin has 12 documented interactions in the NutriStack database: 1 that need timing or caution and 11 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with methylcobalamin.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Activated Charcoal | Timing Sensitive | Activated charcoal adsorbs orally administered methylcobalamin, lowering the amount of B12 available for absorption if the two are taken together. |
| Calcium | Synergy | Calcium may actually assist B12 absorption. Some evidence suggests calcium helps release B12 from food and supports intrinsic factor binding. |
| Cimetidine | Synergy | Methylcobalamin (a free coenzyme form of B12) does not need gastric acid or pepsin to be released from food protein, making it a more reliable B12... details → |
| Combined Oral Contraceptive | Synergy | Methylcobalamin is the active circulating form of vitamin B12 and is depleted along with other B vitamins during combined oral contraceptive use.... details → |
| Famotidine | Synergy | Methylcobalamin (a free coenzyme form of B12) does not require gastric acid for absorption, making it a reliable supplemental B12 source for... details → |
| Iron | Synergy | Both iron and B12 are essential for red blood cell production. Deficiency in either causes anemia. |
| Metformin | Synergy | Metformin reduces serum vitamin B12 by impairing calcium-dependent ileal absorption of B12-intrinsic factor complexes. Meta-analyses report B12... details → |
| Omeprazole | Synergy | Methylcobalamin, the active coenzyme form of vitamin B12, does not require gastric acid or pepsin to be released from food protein, making it a more... details → |
| Pantoprazole | Synergy | Methylcobalamin is a coenzyme form of B12 absorbed without needing gastric acid to free it from dietary protein, making it a reliable B12 source for... details → |
| SAMe | Synergy | SAMe is the universal methyl donor; methylcobalamin supports the methionine cycle that regenerates SAMe. |
| Vitamin B6 | Synergy | B6, B12, and folate work together to metabolize homocysteine. All three are needed for optimal methylation. |
| Vitamin B9 | Synergy | B9 (folate) and B12 work together in the methionine cycle. B12 deficiency can be masked by high folate intake. details → |
The full methylcobalamin profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common methylcobalamin questions.
Quick answers drawn from the table above.
What interacts with Methylcobalamin?
In the NutriStack database, Methylcobalamin has 12 documented interactions with other supplements and medications. The most notable include Activated Charcoal, Calcium, Cimetidine, Combined Oral Contraceptive, and Famotidine.
What works well with Methylcobalamin?
Methylcobalamin pairs synergistically with Calcium, Cimetidine, Combined Oral Contraceptive, Famotidine, and Iron in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Methylcobalamin with Activated Charcoal?
NutriStack classifies the Methylcobalamin and Activated Charcoal pairing as timing sensitive: Activated charcoal adsorbs orally administered methylcobalamin, lowering the amount of B12 available for absorption if the two are taken together. Separate activated charcoal and methylcobalamin by at least 2 hours.
Check your whole stack
See how methylcobalamin fits your routine.
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