Also known as: Acetyl-L-Carnitine, ALCAR, Carnitine
Latest evidence update: 2025-12-15
Strongest in Sample size (82). Held back by Recency (22).
Solid mix of RCTs with some methodological gaps.
Confirmed across many independent studies with significant findings.
Tens of thousands of participants pooled across studies.
Studies agree on direction of effect.
Mostly pre-2020 research; updates may be needed.
Effect-size tagged on 398 of 400 claims for this supplement. Our research updates daily; remaining claims are pending re-processing.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Recommended: Varies by form and individual needs
ProtocolEngine provides general health information based on published research. This is not medical advice. Consult a healthcare professional before starting any supplement or health protocol.
Helps reduce weight and body fat in people with obesity
Improves blood sugar control and reduces insulin resistance in people with diabetes or excess weight
Reduces cholesterol and triglyceride levels, particularly LDL cholesterol
Reduces joint pain and improves physical function in people with osteoarthritis
Improves sperm quality and may increase pregnancy rates in men with fertility problems