Methylfolate (5-MTHF) vs Thiamine (Benfotiamine)

Mechanism

5-methyltetrahydrofolate (5-MTHF) is the biologically active form of folate and the primary methyl donor for remethylation of homocysteine to methionine via methionine synthase (requires B12). This reaction generates SAMe (S-adenosylmethionine), the universal methyl donor for >200 methyltransferase reactions including DNA methylation (gene expression), histone methylation (epigenetics), neurotransmitter synthesis (serotonin, melatonin, norepinephrine), creatine synthesis, and phospholipid methylation (phosphatidylcholine). 5-MTHF crosses the blood-brain barrier via folate receptors.

Standard Dosing

400-800 mcg daily (general health); 5-15mg for depression/MTHFR homozygous

Timing

Morning with B-complex. Start low and titrate up, especially in COMT slow metabolizers.

Cycle Duration

ongoing

Side Effects

• Anxiety/irritability (overmethylation, especially COMT slow)
• Insomnia
• Headache
• Joint pain
• Nausea
• Depression paradoxical worsening (overmethylation)

Contraindications

• Active methotrexate cancer therapy (discuss with oncologist — leucovorin rescue is different)
• Untreated B12 deficiency (folate can mask B12 deficiency, allowing neurological damage to progress)
• Some COMT slow metabolizers may not tolerate high doses

Best Stacking Partners

Mechanism

Benfotiamine is a lipophilic S-acyl derivative of thiamine with 5x greater bioavailability than water-soluble thiamine. Once absorbed, it is converted to thiamine pyrophosphate (TPP), the active coenzyme for pyruvate dehydrogenase (linking glycolysis to Krebs cycle), alpha-ketoglutarate dehydrogenase (Krebs cycle), branched-chain alpha-ketoacid dehydrogenase (BCAA metabolism), and transketolase (pentose phosphate pathway). Benfotiamine specifically activates transketolase, shunting glucose metabolites away from damaging AGE (advanced glycation end-product) formation pathways, hexosamine pathway, and PKC activation — the three major pathways of hyperglycemic damage.

Standard Dosing

150-300mg benfotiamine daily

Timing

With meals. Divide higher doses.

Cycle Duration

ongoing

Side Effects

• Generally very well tolerated
• Mild GI upset (rare)
• Skin rash (very rare)
• Garlic-like body odor at very high doses

Contraindications

• Rare thiamine allergy (more relevant to parenteral administration)

Best Stacking Partners