Magnesium bisglycinate vs citrate vs oxide – absorption, timing & sensitivity

TL;DR (±40 words)

Looking for stomach-friendly magnesium for the evening? Choose bisglycinate (100–200 mg elemental). Citrate is fine but more laxative for sensitive bowels; oxide is relatively less absorbed and more rapidly laxative. Stick to the UL 350 mg/day from supplements; get the rest from food.

Why form matters

Magnesium is always Mg²⁺. The difference lies in the salt/chelate surrounding it, which affects absorption and tolerance.

Bisglycinate (chelate)

• Pros: often stomach/bowel friendly, popular evening form; stable absorption.

• Cons: per mg elemental often a bit more expensive.

• Suits: sensitive bowels, evening routine, “low-stim.”

Citrate

• Pros: well-researched, good absorption.

• Cons: can be laxative in higher doses/sensitive bowels.

• Suits: general supplementation, provided your bowels tolerate it well.

Oxide

• Pros: high % elemental Mg per tablet (cheap).

• Cons: lower bioavailability and laxative; less suitable for sensitive bowels/evening.

• Suits: situations where price is paramount and tolerance is not an issue.
  
  
  

How much and when (practical)

• Daily basic (supplement): 100–200 mg elemental Mg.

• Upper limit (UL) from supplements: 350 mg/day (dietary Mg does not count).

• Timing: many people choose in the evening (relaxation; less GI burden during the day).

• Combinations: Mg + taurine (calm focus) works well in the evening; creatine and potassium can be taken during the day.

Beargymmies® Performance+ provides per 5 gummies: Magnesium (bisglycinate) 100 mg + Creatine 5 g + Taurine 833 mg + Potassium 250 mg – perfectly suitable as an evening base.

Do's & Don'ts

Do’s

• Start low (100 mg) and build up to 200 mg if you tolerate it well.

• For sensitive bowels, take bisglycinate and eat something small with it.

• Get the bulk from food (nuts/seeds, legumes, whole grains, cocoa, leafy green vegetables).

Don’ts

• Do not exceed 350 mg/day from supplements (UL).

• Do not combine with separate potassium stacks without reason/doctor's advice (especially with kidney issues/medication).

• Don't expect a "sleeping pill" effect; see it as low-stim support.

Quick Choice Guide

• Sensitive stomach / evening: bisglycinate.

• Good bowels / day: citrate can also work.

• Budget only: oxide can work, but less ideal (absorption/tolerance).
  
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Conclusion

For the evening and good tolerance, magnesium bisglycinate (100–200 mg) is usually the most practical choice. Citrate is solid but a bit more “active” on the bowels; oxide is the most laxative and is relatively less absorbed. Adhere to the UL 350 mg and get the rest from whole foods.

CTA

👉 Beargymmies® Performance+ (sugar-free, vegan) – 5 gummies/day = Mg bisglycinate 100 mg + Creatine 5 g + Taurine 833 mg + Potassium 250 mg. Evening-friendly low-stim routine.

Sources 

• NIH ODS – Magnesium Fact Sheet (Health Professional)
  https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/

• Gröber et al. (2017) – Magnesium in Prevention and Therapy, Nutrients
  https://www.mdpi.com/2072-6643/9/12/1293

• EFSA – Tolerable Upper Intake Level (UL) for supplementary Mg (350 mg/d)
  https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2018.5239

• Walker et al. – Magnesium and neuromuscular/neurological function (review)
  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6024559/