L-carnitine L-tartrate
LCLT, L-carnitine tartrate, Levocarnitine, Carnipure, Acetyl-L-carnitine, ALCAR
Forms: L-carnitine L-tartrate (LCLT, studied for recovery), plain L-carnitine liquids, acetyl-L-carnitine (ALCAR, brain-focused) and glycine propionyl-L-carnitine (GPLC).
A nutrient that carries fatty acids into mitochondria; the body makes it and meat supplies it. The tartrate form is mainly studied for recovery after resistance training.
Legal status: Sold freely as a supplement and as a prescription drug for carnitine deficiency; not prohibited by WADA, but large-volume IV infusions or injections of any substance are banned (M2.2).
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Used to reduce muscle damage and soreness after hard training and, as 'carnitine', for fat loss. Recovery effects are modest; weight-loss meta-analyses show small effects, mostly in overweight adults.
What people seek and what studies show
Small trials of the tartrate form show lower muscle-damage markers and less soreness after heavy lifting. Oral carnitine alone barely enters muscle; in a six-month trial, taking it with plenty of carbohydrate raised muscle carnitine by 21% and 30-minute test output by 11%, versus no change with carbohydrate alone. In a 37-trial meta-analysis on weight, body-fat percentage and waist size did not change.
Effects
Evidence: Limited human data — some human studies, small or short
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
3 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 1 of 3 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. For the rest — general advice. No measure removes a risk completely.
Low-level side effects
How each option helps (2)
- Working with a doctor — Assesses persistent vomiting or severe belly pain (possible pancreatitis or gallstones) and adjusts prescribed GLP-1 treatment when nausea persists.
- Pancreatin + dimeticone (Pankreoflat) — May ease heaviness and gas after meals; can cause nausea or diarrhea. Not for pork or cow's milk protein allergy (anaphylaxis reported) or early acute pancreatitis.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Myth & fact
“Does carnitine burn fat on its own?”
Not meaningfully. Oral carnitine raises muscle carnitine slowly, if at all; meta-analyses show about 1 kg extra weight loss, mostly in overweight adults.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check