Magnesium Glycinate vs Taurine

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)

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Mechanism

Taurine is a sulfonic acid amino acid (not incorporated into proteins) with diverse physiological roles. It is the most abundant free amino acid in excitable tissues (heart, brain, retina, muscle). Mechanisms: GABA-A receptor agonism (inhibitory neurotransmission), glycine receptor agonism, osmoregulation (cell volume regulation via taurine transporter TauT), bile acid conjugation (taurocholate formation for fat digestion), calcium handling in cardiomyocytes (modulates RyR2/SERCA2a), mitochondrial protein synthesis (taurine modification of mitochondrial tRNA), and potent antioxidant (directly scavenges HOCl, stabilizes membranes). Recently identified as a longevity-associated molecule — taurine levels decline with age and supplementation extends lifespan in mice.

Standard Dosing

1000-3000mg daily

Timing

Flexible. Evening preferred for sleep/relaxation benefits. Pre-workout for cardiac and exercise performance benefits.

Cycle Duration

ongoing

Side Effects

• Generally extremely well-tolerated
• Mild GI discomfort
• Drowsiness at high doses
• Rare: hypothermia in preclinical data

Contraindications

• Bipolar disorder on lithium (monitor levels)
• Severe renal impairment
• Caution with severe renal impairment

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