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Types of Metformin (Longevity Context): Forms & Bioavailability

Evidence:Emerging
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Forms Comparison

FormBioavailabilityBest For
Metformin Extended-Release (ER)ModerateReduced GI side effects — slower release minimizes nausea and diarrhea that limit tolerance of immediate-release
Metformin Immediate-Release (IR)Moderate-HighStandard form — most studied version but higher rate of GI side effects

Metformin Extended-Release (ER)

Bioavailability: Moderate. Best for: Reduced GI side effects — slower release minimizes nausea and diarrhea that limit tolerance of immediate-release.

Metformin Immediate-Release (IR)

Bioavailability: Moderate-High. Best for: Standard form — most studied version but higher rate of GI side effects.

Full Metformin (Longevity Context) Guide

References

  1. ObservationalBannister CA, Holden SE, Jenkins-Jones S, et al. (2014). Can people with type 2 diabetes live longer than those without? A comparison of mortality in people initiated with metformin or sulphonylurea monotherapy and matched, non-diabetic controls. Diabetes, Obesity and Metabolism. DOI PubMed
  2. Meta-analysisGandini S, Puntoni M, Heckman-Stoddard BM, et al. (2014). Metformin and cancer risk and mortality: a systematic review and meta-analysis taking into account biases and confounders. Cancer Prevention Research. DOI PubMed
  3. RCTKonopka AR, Laurin JL, Schoenberg HM, et al. (2019). Metformin inhibits mitochondrial adaptations to aerobic exercise training in older adults. Aging Cell. DOI PubMed