Magnesium Glycinate vs Thiamine (Benfotiamine)

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

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)

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