Creatine supplementation is generally considered safe for long-term use. Here are some key points backed by research:

1. Safety and Efficacy: According to the International Society of Sports Nutrition, both short-term and long-term creatine supplementation (up to 30 g/day for 5 years) is safe and well-tolerated in healthy individuals and various patient populations¹.

2. Clinical Studies: Long-term studies have shown that creatine supplementation does not significantly affect markers of health, such as renal function, liver enzymes, and overall clinical health in athletes and other groups²³.

3. Adverse Effects: Some studies have reported minor side effects like weight gain due to water retention, gastrointestinal discomfort, nausea, and diarrhea. However, these side effects are generally infrequent and mild²⁴.

4. Kidney Health: Concerns about creatine affecting kidney function are mostly unsubstantiated by well-controlled studies. Studies both in athletes and clinical populations have shown no significant impact on kidney function¹²⁵.

Therefore, it appears that continuing creatine supplementation beyond three months is generally safe for most people. However, if you have pre-existing health conditions or concerns, it's always a good idea to consult with a healthcare professional before continuing any supplement long-term.

Footnotes

1. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine ↩ ↩²

2. Few adverse effects of long-term creatine supplementation in a placebo-controlled trial ↩ ↩² ↩³

3. Long-term creatine supplementation does not significantly affect clinical markers of health in athletes ↩

4. Adverse effects of creatine supplementation: fact or fiction? ↩

5. Is It Time for a Requiem for Creatine Supplementation-Induced Kidney Failure? A Narrative Review ↩