L-Carnitine / ALCAR
Full ranking Dose tool Products (813)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Reference upper value (cited, not a UL): 2,000 mg
Median (Per day)434 mgP5 30 – P95 1,500
Products813
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=l.carnitine2&lang=eng · Health Canada NNHPD monograph: max 4 g L-carnitine/day and 2 g per single dose
Daily dose across products (mg/day)
Reference upper value (cited, not a UL) 2,000
3 mglog scale · n=8133,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Common questions
Is there an official upper limit for L-Carnitine / ALCAR?
No UL has been set. We use a cited reference upper value of 2,000 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]
How much L-Carnitine / ALCAR do products usually contain per day?
As of 2026-11-01, 813 products list a comparable daily dose (855 dose records; one product can have several). The median is 434 mg per day, and 90% of records fall between 30 and 1,500 mg. Figures come from labels and are not lab-tested. [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Metagenics | L-Carnitine | 500 mg | 100.0 |
| 1 | MET-Rx | L-Carnitine 1000 mg | 2,000 mg | 100.0 |
| 3 | GNC | L-Carnitine 500 mg | 500 mg | 97.8 |
| 3 | Swanson | L-Carnitine Fumarate 450 mg | 450 mg | 97.8 |
| 5 | Doctor's Best | Best L-Carnitine Fumarate | 855 mg | 94.4 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.