Supplement·Interactions·Reviewed June 9, 2026
Vitamin B6 interactions.
Vitamin B6 has 29 documented interactions in the NutriStack database: 4 that need timing or caution and 25 that work synergistically. The full list, with what each pairing does, is below.
Vitamin B6 at a glance.
A quick, data-grounded summary. The full table is below.
Vitamin B6 has 29 documented interactions in the NutriStack database: 4 that need timing or caution and 25 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with vitamin b6.
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 |
|---|---|---|
| Levodopa/Carbidopa | Caution | Vitamin B6 (pyridoxine) is a cofactor for DOPA decarboxylase, which converts levodopa to dopamine peripherally before it reaches the brain. While... details → |
| Linezolid | Caution | Vitamin B6 (pyridoxine) is the cofactor for aromatic L-amino acid decarboxylase, the enzyme that converts 5-HTP to serotonin and L-DOPA to dopamine.... |
| Niacin (Prescription) | Caution | Niacin (nicotinic acid) is a B-vitamin (vitamin B3). High-dose prescription niacin overlaps with niacin supplements and is sometimes combined with... |
| Cholestyramine | Timing Sensitive | Cholestyramine can bind and reduce intestinal absorption of folate, and folate deficiency has been documented with prolonged therapy, especially in... |
| 5-HTP | Synergy | Vitamin B6 (as PLP) is a required cofactor for aromatic L-amino acid decarboxylase, which converts 5-HTP to serotonin. |
| Carbamazepine | Synergy | Carbamazepine and other enzyme-inducing antiseizure drugs have been linked with lower vitamin B6 status. Low B6 can contribute to high homocysteine... details → |
| Combined Oral Contraceptive | Synergy | Combined oral contraceptives lower plasma pyridoxal-5-phosphate (active vitamin B6) and can contribute to low mood, irritability, and nausea. In a... details → |
| Essential Amino Acids | Synergy | Vitamin B6 is required for amino acid transamination reactions. |
| Hydralazine | Synergy | Long-term hydralazine can interfere with vitamin B6 biology and has caused pyridoxine-deficiency neuropathy in case reports. Vitamin B6 can help... details → |
| Isoniazid | Synergy | Isoniazid functionally antagonizes pyridoxine and can cause peripheral neuropathy; vitamin B6 supplementation prevents this in at-risk patients. |
| L-Methionine | Synergy | Vitamin B6 is the obligate cofactor for the transsulfuration enzymes that clear the homocysteine generated when L-Methionine is metabolized. In... details → |
| L-Theanine | Synergy | Both support GABA production. B6 is the cofactor for glutamic acid decarboxylase, which synthesizes GABA. L-theanine increases GABA levels. |
| L-Tyrosine | Synergy | Vitamin B6 (PLP) is a required cofactor for tyrosine hydroxylase, which converts L-tyrosine to L-DOPA in the dopamine synthesis pathway. |
| Levetiracetam | Synergy | Levetiracetam can cause irritability, agitation, mood changes, or aggression in some people. Pyridoxine (vitamin B6) has clinical evidence as an... details → |
| Magnesium Citrate | Synergy | Vitamin B6 increases intracellular magnesium accumulation. Magnesium is required for B6 activation to its coenzyme form PLP. |
| Magnesium Glycinate | Synergy | Vitamin B6 increases intracellular magnesium accumulation. Magnesium is required for B6 activation to its coenzyme form PLP. |
| Magnesium L-Threonate | Synergy | Vitamin B6 increases intracellular magnesium accumulation. Magnesium is required for B6 activation to its coenzyme form PLP. |
| Magnesium Malate | Synergy | Vitamin B6 increases intracellular magnesium accumulation. Magnesium is required for B6 activation to its coenzyme form PLP. |
| Magnesium Taurate | Synergy | Vitamin B6 increases intracellular magnesium accumulation. Magnesium is required for B6 activation to its coenzyme form PLP. |
| Medroxyprogesterone | Synergy | DMPA can cause or worsen low mood in some users, and depleted B6 status (common in women on hormonal contraception) may contribute. Modest B6... details → |
| Methylcobalamin | Synergy | B6, B12, and folate work together to metabolize homocysteine. All three are needed for optimal methylation. |
| Methylfolate | Synergy | B6 is required for the conversion of serine to glycine, which generates 5,10-methyleneTHF needed for folate-dependent one-carbon metabolism. |
| Phenytoin | Synergy | Enzyme-inducing antiseizure drugs such as phenytoin have been associated with vitamin B6 deficiency. Low B6 can contribute to neuropathy symptoms... details → |
| SAMe | Synergy | Supplemental SAMe increases flux through the methionine cycle and generates homocysteine downstream. Vitamin B6 is the cofactor that allows the... details → |
| Theophylline | Synergy | Vitamin B6 may help correct low pyridoxal phosphate status associated with long-term theophylline therapy. |
| Vitamin B12 | Synergy | B6, B12, and folate work together to metabolize homocysteine. All three are needed for optimal methylation. |
| Vitamin B2 | Synergy | Riboflavin (B2) is needed for the conversion of B6 to its active coenzyme form PLP. |
| Vitamin B9 | Synergy | B6 is required for the conversion of serine to glycine, which generates 5,10-methyleneTHF needed for folate-dependent one-carbon metabolism. |
| Vitex (Chasteberry) | Synergy | Vitamin B6 is sometimes paired with PMS support and may influence neurotransmitter and prolactin-related pathways. |
The full vitamin b6 profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common vitamin b6 questions.
Quick answers drawn from the table above.
What interacts with Vitamin B6?
In the NutriStack database, Vitamin B6 has 29 documented interactions with other supplements and medications. The most notable include Levodopa/Carbidopa, Linezolid, Niacin (Prescription), Cholestyramine, and 5-HTP.
What works well with Vitamin B6?
Vitamin B6 pairs synergistically with 5-HTP, Carbamazepine, Combined Oral Contraceptive, Essential Amino Acids, and Hydralazine in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Vitamin B6 with Levodopa/Carbidopa?
NutriStack classifies the Vitamin B6 and Levodopa/Carbidopa pairing as caution: Vitamin B6 (pyridoxine) is a cofactor for DOPA decarboxylase, which converts levodopa to dopamine peripherally before it reaches the brain. While carbidopa blocks... Avoid high-dose vitamin B6 supplements (>50mg/day) while on levodopa/carbidopa. Standard multivitamin doses of B6 (2-10mg) are generally safe when...
Check your whole stack
See how vitamin b6 fits your routine.
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