Magnesium Glycinate vs Tart Cherry Extract

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

Tart cherry (Prunus cerasus) is rich in anthocyanins (cyanidin-3-glucoside, cyanidin-3-rutinoside) and proanthocyanidins that inhibit COX-1 and COX-2 enzymes (comparable to ibuprofen in in vitro studies), suppress NF-kB-mediated inflammatory signaling, and scavenge reactive oxygen and nitrogen species. Tart cherry also contains natural melatonin (13.5 ng/g) and tryptophan, supporting sleep quality. The anti-inflammatory and antioxidant effects reduce exercise-induced muscle damage (EIMD) markers (CRP, IL-6, creatine kinase) and accelerate recovery of muscle function post-exercise.

Standard Dosing

480-960mg tart cherry extract daily or 8-12 oz tart cherry juice concentrate

Timing

Split AM/PM. Begin 4-5 days before anticipated intense training or competition for maximal protective effect. Continue 2-3 days after.

Cycle Duration

Event-based (4-7 day windows around intense training) or ongoing at lower dose

Side Effects

• GI discomfort at high juice volumes
• Potential blood sugar impact (juice form — extract has minimal sugar)
• Staining of teeth/clothing from juice

Contraindications

• None significant. Diabetics should consider sugar content of juice form.

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