pepdex
Stack essential · Deficiency fix

Magnesium (Glycinate)

Electrolyte that drops with GLP-1 GI side effects and high-dose injection cycles.

What it is

Essential mineral. Glycinate form is the most bioavailable and least likely to cause loose stools. Required for 300+ enzymatic reactions including ATP synthesis and nerve function.

Why peptide users take it

GLP-1 users on tirzepatide/retatrutide get diarrhea and reduced food intake; both deplete magnesium. Symptoms: muscle cramps, fatigue, poor sleep, irritability. Many users dismiss these as 'just the peptide' when it's actually correctable.

Pairs with these peptides

How it actually works

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Dose

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When to take

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Signs you actually need this

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Signs it's working

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Common mistakes

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Where to buy

Editorial picks. Brand selection follows the quality criteria (USP/NSF or third-party COA where possible). Affiliate links — see the disclosure at the bottom of /supplements.

Caveats

  • Avoid magnesium oxide — poor absorption, mostly causes diarrhea.
  • Don't stack with high-dose calcium at the same time; they compete.

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Members get the full mechanism, dose protocols, side effects, contraindications, common mistakes, drug interactions, and the Pepdex hot take — on every entry.

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Also worth knowing: if you're injecting peptides alongside this stack, the injection-supplies page covers syringes, pads, sharps, and vial storage in the same quality-first format. Browse supplies →
Educational reference only. Not medical advice. Talk to a doctor before starting any supplement, especially if you take prescription medications or have an underlying condition.