Buy L-carnitine

Products that match the form and dose used in the studies. Umbral earns a commission on some purchases; the order never changes because of it.

Moderate

2 g/day elemental L-carnitine (as 3 g LCLT). Trials span 1-3 g/day; nothing supports going higher.

Ratings, prices and photos were read from Amazon on Sep 18, 2026. Amazon prices change; the current one is on the product page.

As an Amazon Associate, Umbral earns from qualifying purchases. Product data is provided by Amazon and may change; ratings and prices shown are Amazon’s, not Umbral’s. Recommendations are based on the evidence grade and the form used in trials, never on commission.

Nutricost L-Carnitine Tartrate 1,000 mg, 240 Capsules

4.7(4,366)

$19.95

L-carnitine L-tartrate is the form the muscle-soreness trials used. Three grams of LCLT gives the 2 g of elemental carnitine those studies dosed.

Buy on Amazon

Amazon price on Sep 18, 2026.

NaturaLife Labs Acetyl L-Carnitine (ALCAR) 1500 mg

4.5(13,611)

$16.95

The acetylated form crosses into the brain, so this is the one to pick if the target is fatigue and mental sharpness rather than muscle recovery. Thirteen thousand ratings.

Buy on Amazon

Amazon price on Sep 18, 2026.

NOW Supplements L-Carnitine 1,000 mg, Purest Form

4.6(5,651)

$28.85

Free-form L-carnitine, no tartrate, no acetyl — the neutral option if you want to keep the variable simple.

Buy on Amazon

Amazon price on Sep 18, 2026.

Browse all options on Amazon

Prefer to compare yourself? This opens Amazon’s full selection for this supplement, filtered to the form we recommend.

See all on Amazon

What to look for

✓L-carnitine L-tartrate (LCLT) for recovery — 3 g LCLT delivers ~2 g elemental carnitine. Acetyl-L-carnitine (ALCAR) if the target is fatigue/cognition rather than muscle soreness.
✓2 g/day elemental L-carnitine (as 3 g LCLT). Trials span 1-3 g/day; nothing supports going higher.
✓Third-party tested (USP, NSF, Informed Sport)

What to avoid

✕Proprietary blends that hide the dose per ingredient
✕Unstandardised extracts with no active-compound percentage

Safety notes

· Fishy body and breath odour from trimethylamine is common at ≥2 g/day and is the main reason people stop.
· Nausea, cramps and diarrhoea, dose-dependent.
· Chronic loading raises TMAO, a metabolite linked to atherosclerosis in human cohorts — avoid open-ended daily use without a reason.

See the science Go to my supplements

As an Amazon Associate, Umbral earns from qualifying purchases. Product data comes from Amazon and may change; ratings and prices are Amazon's, not Umbral's. Suggestions are based on the science and the form used in studies, never on commission.

Umbral is a wellness product, not a medical device. It does not diagnose, treat, cure or prevent any disease. Supplement information is educational; talk to a clinician before starting anything, especially if you are pregnant, under 18, managing a condition or taking medication.

These statements have not been evaluated by the Food and Drug Administration.