B-Complex (Methylated) vs Magnesium Glycinate

Mechanism

Methylated B-complex provides the bioactive coenzyme forms of all 8 B vitamins, bypassing genetic polymorphisms (particularly MTHFR) that impair activation. Key forms: methylfolate (5-MTHF) and methylcobalamin serve as methyl donors in the methylation cycle (homocysteine to methionine via methionine synthase), supporting DNA synthesis, epigenetic regulation, and neurotransmitter production. Riboflavin-5-phosphate (active B2) is a cofactor for MTHFR enzyme itself. P5P (active B6) is essential for >150 enzymatic reactions including GABA, serotonin, and dopamine synthesis. Benfotiamine (lipophilic B1) supports transketolase in the pentose phosphate pathway.

Standard Dosing

1 capsule daily of a comprehensive methylated B-complex

Timing

Morning with breakfast (B vitamins are energizing; PM dosing may disrupt sleep). Neon yellow urine is normal (riboflavin excretion).

Cycle Duration

ongoing

Side Effects

• Neon yellow urine (riboflavin — harmless)
• Nausea if taken on empty stomach
• Anxiety/overstimulation in COMT slow metabolizers from excess methyl donors
• Skin flushing (niacin component, if non-flush form not used)
• Acne (B12 in some individuals)

Contraindications

• Levodopa monotherapy (without carbidopa)
• Active methotrexate therapy (discuss folate with oncologist)
• COMT V158M homozygous (may not tolerate methyl donors well — see notes)

Best Stacking Partners

Mechanism

Magnesium is a cofactor for >600 enzymatic reactions including all ATP-dependent reactions (Mg-ATP is the true substrate), DNA/RNA polymerases, and ion channel regulation. Magnesium glycinate chelate provides highly bioavailable elemental magnesium bound to glycine. The glycine moiety itself is an inhibitory neurotransmitter (glycine receptors) and NMDA receptor co-agonist at the glycine binding site. The chelated form minimizes the osmotic laxative effect of ionic magnesium salts. Magnesium regulates NMDA receptor gating (voltage-dependent Mg2+ block), GABA-A receptor potentiation, HPA axis modulation, and parathyroid hormone secretion.

Standard Dosing

200-400mg elemental magnesium daily

Timing

Evening/bedtime (promotes relaxation and sleep quality). Can split AM/PM.

Cycle Duration

ongoing

Side Effects

• Drowsiness
• Mild GI discomfort
• Loose stools (less than other Mg forms)
• Hypotension at very high doses

Contraindications

• Severe renal insufficiency (impaired Mg excretion — risk of hypermagnesemia)
• Myasthenia gravis (Mg can worsen neuromuscular junction blockade)
• Heart block (Mg slows AV conduction)

Best Stacking Partners