Kidney disease and reduced eGFR
Creatine has a favorable safety record in healthy adults, but people with chronic kidney disease or significant kidney impairment should not self-administer it without nephrology or clinician oversight.
Creatine evidence by outcome
Creatine
Creatine has a deep research base, but strength, muscle preservation, cognition, menopause, and GLP-1 support are different decisions. Start with the outcome and population that match your question.
Amino Acid Derivative
4
goal pages covered
Reviewed
Evidence-led rankings
Evidence graded
Clinical relevance
Safety reviewed
Risks and interactions
Dosing checked
Evidence-based ranges
No medical claims
Research only
Updated regularly
New evidence tracked
Standard safety disclaimers
- Pregnancy and breastfeeding: Consult your healthcare provider before taking this supplement during pregnancy or while nursing. The safety of supplemental doses beyond dietary intake has not been established in pregnant or lactating women.
- Blood thinners: If you take blood-thinning medications (e.g., warfarin, apixaban, rivaroxaban, clopidogrel, or high-dose aspirin), consult your healthcare provider BEFORE starting this supplement, as it may have additive antiplatelet or anticoagulant effects.
- Kidney disease: If you have chronic kidney disease (CKD) or any significant kidney impairment, consult your healthcare provider before taking this supplement. Some supplements can accumulate to dangerous levels when kidney function is reduced.
- Gout: Individuals with gout should consult their healthcare provider before starting this supplement. Certain supplements (e.g., collagen, fish oil, niacin) may affect uric acid levels or trigger flares in susceptible individuals.
- Important: This supplement is not a replacement for prescription medications. It is supportive for individuals with low baseline status, not a treatment for diagnosed conditions (anxiety disorders, insomnia, hypertension, osteoporosis, etc.). Do not stop or reduce any prescription without consulting your doctor.
Compare the evidence by outcome
What do you want creatine to help with?
Evidence is outcome-specific. Start with the result you care about instead of treating one supplement grade as universal. Paths are ordered by the evidence labels already attached to the published guides.
Strong evidence for this outcome
Muscle Preservation
Evidence-ranked creatine picks for adults protecting lean muscle during caloric restriction or weight loss. Reviewed against clinical trial dosing and GLP-1
3 products comparedReview creatine for this goal →
Strong evidence for this outcome
Brain Health
Evidence-based creatine for memory and brain energy. Compare top products for cognitive performance in adults 35+. Clinical evidence inside.
2 products comparedReview creatine for this goal →
Evidence reviewed on page
Menopause Support
Creatine for women 40+ in peri- and post-menopause. Evidence-based picks for lean mass, strength, and bone — honest dosing and YMYL safety inside.
3 products comparedReview creatine for this goal →
Limited evidence
GLP-1 Muscle Loss Prevention
Struggling with muscle loss on GLP-1 medications? We reviewed the best creatine supplements backed by clinical evidence to help you preserve lean mass in 2026.
3 products comparedReview creatine for this goal →
Evidence context
What the evidence can support
These bands organize the labels already attached to published Atlas pages. They do not create a universal grade for the supplement or outcome.
Best supported
Human evidence is comparatively stronger for these published paths.
Useful, but incomplete
Human evidence exists, but certainty, population fit, or effect size remains limited.
Evidence is early
Treat these as uncertain or context-dependent rather than established uses.
Evidence context
The ingredient is familiar; the outcome still matters
Creatine monohydrate is the reference form in much of the human research. Evidence strength, studied population, training context, and practical expectations still vary across muscle, performance, healthy-aging, and cognitive outcomes.
Safety at a glance
Important creatine cautions
- Creatine can raise serum creatinine without necessarily indicating kidney injury; tell the clinician interpreting your laboratory results.
- People with kidney disease, reduced eGFR, dehydration risk, or kidney-risk medicines need clinician oversight.
- A small early increase in body weight from intracellular water is common and should not be confused with fat gain.
Full safety guidance
Check fit before using this supplement
Creatinine laboratory interpretation
Supplemental creatine can modestly increase serum creatinine because creatinine is a breakdown product of creatine. Tell the clinician interpreting kidney-function tests that you use creatine.
Water weight and gastrointestinal tolerance
An early increase in intracellular water and occasional gastrointestinal discomfort can occur. These effects are different from fat gain and usually resolve or stabilize.
Pregnancy and breastfeeding
Routine supplemental use during pregnancy or breastfeeding has not been adequately established. Discuss use with a qualified healthcare professional.
Clinical-care boundary
Creatine can support training and nutrition strategies, but it is not a treatment for sarcopenia, neurologic disease, osteoporosis, unexplained fatigue, or GLP-1-related complications.
Safety varies by ingredient form, dose, health history, and medication use. The linked outcome pages retain their complete server-rendered safety notes.
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Next steps
Where to go next
Compare monohydrate vs HCl
See how form claims compare with the research base.
Browse muscle-preservation evidence
Compare creatine with other published options.
Open the evidence scorecard
Inspect evidence strength across published outcomes.
Read the methodology
See how evidence and product signals are graded.