Acetyl-L-Carnitine (ALCAR) and L-Carnitine
Each entry’s own grades, side by side. A grade says how strong the evidence is for one outcome — it does not rank one entry over the other.
Compound or practice
Acetyl-L-Carnitine (ALCAR)
The brain-penetrant carnitine — real evidence for diabetic neuropathy, softer signals for mood and aging cognition.
Grade B3 graded outcomesrevised Jul 10, 2026
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
Compound or practice
L-Carnitine
A fat-transport shuttle that rarely aids fat loss in the well-fed — better evidence for recovery and specific clinical states.
Grade C3 graded outcomesrevised Jul 10, 2026
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
Graded in both
Outcomes are matched by name. Two entries can describe the same outcome in different words, so one listed further down may still be graded in the other.
No outcome has the same name in both entries. They may still overlap under different wording — read the two lists below.
Graded only in Acetyl-L-Carnitine (ALCAR)
- Diabetic neuropathy pain Moderate effectEvidence grade B
- Depression (older adults) Small effectEvidence grade B
- Cognition (MCI/aging) Small effectEvidence grade C
Graded only in L-Carnitine
- Fat loss (healthy adults) Trivial effectEvidence grade D
- Exercise recovery / soreness Small effectEvidence grade C
- Diabetic neuropathy (ALCAR) Small effectEvidence grade C
What each entry says about the other
- Acetyl-L-Carnitine (ALCAR)’s entry · Works together: Overlapping carnitine pool; ALCAR is the more brain-penetrant form.
- Acetyl-L-Carnitine (ALCAR)’s entry · Goes with: Overlapping carnitine pool; ALCAR is the more brain-penetrant form.
Both columns are read from the entries as they stand in this library. A comparison is not advice to take either one, and it is no substitute for a clinician who knows the person.