Creatine Supplementation Safety in a 72-Year-Old Male
Yes, 5 g/day of creatine monohydrate is safe for a typical 72-year-old male with normal renal function, based on the most recent and highest-quality evidence showing no clinically significant kidney injury despite transient increases in serum creatinine.
Key Evidence Supporting Safety
The most recent 2025 systematic review and meta-analysis 1 demonstrates that creatine supplementation causes only a small, statistically significant increase in serum creatinine (0.07 µmol/L), but critically shows no significant changes in glomerular filtration rate (GFR), indicating preserved kidney function. This finding is corroborated by the 2026 meta-analysis 2, which found that while serum creatinine increases and creatinine-based GFR estimates decrease, GFR measured by the gold-standard Cr-EDTA method shows no significant change (MD 5.89 mL/min; P=0.06), confirming that the creatinine elevation reflects altered creatinine metabolism rather than actual kidney injury.
Understanding the Creatinine Paradox
The increase in serum creatinine with creatine supplementation is a metabolic phenomenon, not kidney damage:
- Creatinine is a breakdown product of creatine metabolism
- Increased creatine stores naturally lead to increased creatinine production 3
- Multiple studies show no changes in sensitive kidney injury biomarkers (KIM-1, MCP-1) 3, albuminuria, proteinuria, or serum urea 1, 2
- The 2020 study in young healthy subjects 3 confirmed that values remained within normal reference ranges despite the increase
Clinical Application for a 72-Year-Old
For your specific patient, the following algorithm applies:
Prerequisites (Must Meet All):
- Normal baseline renal function (eGFR >60 mL/min/1.73 m²)
- No pre-existing kidney disease
- No diabetes or uncontrolled hypertension
- Normal serum potassium
Dosing Protocol:
- 5 g/day maintenance dose is appropriate and well-studied 3, 4, 1
- No loading phase necessary (the 20 g/day loading phase is optional and increases creatinine more acutely 4)
Monitoring Strategy:
- Baseline serum creatinine and eGFR before starting 5
- Expect serum creatinine to increase by approximately 0.1-0.15 mg/dL 1, 2
- Do not discontinue based on creatinine elevation alone if it remains <30% above baseline 1
- Monitor for actual kidney injury markers: proteinuria, albuminuria, or symptoms
- Recheck at 4-8 weeks, then as clinically indicated
Important Caveats and Pitfalls
Common Mistake to Avoid:
Do not interpret the expected creatinine increase as kidney damage. The 2026 narrative review 6 emphasizes that creatinine-based eGFR equations become unreliable during creatine supplementation because they assume steady-state creatinine production—an assumption violated by increased creatine metabolism.
Contraindications:
The 2011 safety review 5 advises against high-dose creatine (>3-5 g/day) in patients with:
- Pre-existing renal disease
- Diabetes with nephropathy
- Uncontrolled hypertension
- Reduced baseline GFR
Your 72-year-old patient with normal renal function does not meet these contraindications.
Additional Benefits in Older Adults
The 2026 evidence 6, 7 highlights that creatine supplementation may provide particular benefits for older adults:
- Preservation of muscle mass and strength (sarcopenia prevention)
- Neuroprotection and cognitive function support
- Modulation of inflammation and oxidative stress
- The adequate intake for adult men is approximately 400 mg/day 7, so 5 g/day provides substantial supplementation
Duration of Safety
Studies demonstrate safety for:
The 2025 meta-analysis 1 subgroup analysis showed that creatinine increases are most pronounced in the first week, stabilize between 1-12 weeks, and remain stable beyond 12 weeks, suggesting no progressive kidney damage over time.