Best L-Carnitine Supplements 2026: Cost per Effective Dose
Top pick for L-Carnitine: Nutricost Acetyl L-Carnitine (ALCAR) 500 mg (180 Capsules) — 500mg acetyl-L-carnitine per 1 capsule (500 mg), None (NSF-registered facility), $0.11/day. Our best-value pick.
All L-Carnitine Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Nutricost Acetyl L-Carnitine (ALCAR) 500 mg (180 Capsules) | Nutricost | 500mg acetyl-L-carnitine / 1 capsule (500 mg) | $0.11 | None (NSF-registered facility) | Best Value | Buy |
| BulkSupplements L-Carnitine L-Tartrate Powder, 1000 mg per serving (250 g) | BulkSupplements | 1,000mg L-carnitine (as LCLT) / 1 g scoop | $0.11 | None (third-party tested) | Buy | |
| NOW Acetyl-L Carnitine 500 mg (200 Veg Capsules) | NOW Foods | 500mg acetyl-L-carnitine / 1 capsule (500 mg) | $0.14 | None (cGMP) | Buy | |
| Horbaach L-Carnitine 500 mg, as L-Carnitine L-Tartrate (60 Capsules) | Horbaach | 500mg L-carnitine (as LCLT) / 1 capsule (500 mg) | $0.16 | None | Buy | |
| Nutricost L-Carnitine Tartrate 1000 mg per serving (240 Capsules) | Nutricost | 1,000mg L-carnitine (as LCLT) / 2 capsules (1,000 mg) | $0.17 | None (NSF-registered facility) | Buy | |
| NOW L-Carnitine 500 mg, Free-Form (180 Veg Capsules) | NOW Foods | 500mg L-carnitine / 1 capsule (500 mg) | $0.18 | None (cGMP) | Buy | |
| Jarrow Formulas Acetyl L-Carnitine 500 mg (120 Veggie Capsules) | Jarrow Formulas | 500mg acetyl-L-carnitine / 1 capsule (500 mg) | $0.27 | None | Buy | |
| BulkSupplements Acetyl L-Carnitine Powder, 1.5 g per serving (100 g) | BulkSupplements | 1,500mg acetyl-L-carnitine / 1.5 g scoop | $0.33 | None (third-party tested) | Buy | |
| Doctor's Best Acetyl-L-Carnitine 1000 mg per serving (120 Veg Caps) | Doctor's Best | 1,000mg acetyl-L-carnitine / 2 capsules (1,000 mg) | $0.38 | None | Buy | |
| NOW L-Carnitine Liquid 1000 mg, Citrus (16 oz) | NOW Foods | 1,000mg L-carnitine / 1 tbsp (1,000 mg) | $0.51 | None (cGMP) | Buy | |
| Thorne Acetyl-L-Carnitine 500 mg (60 Capsules) | Thorne | 500mg acetyl-L-carnitine / 1 capsule (500 mg) | $0.52 | Third-party certified (Thorne / NSF) | Buy | |
| Nature's Bounty L-Carnitine 500 mg (30 Tablets) | Nature's Bounty | 500mg L-carnitine / 1 tablet (500 mg) | $0.61 | None | Buy | |
| Biolor Propionyl-L-Carnitine (PLC) HCl (120 Capsules) | Biolor | 1,000mg propionyl-L-carnitine / 2 capsules (~1,000 mg) | $0.63 | None | Buy | |
| Life Extension Optimized Carnitine, three forms incl. 300 mg PLC (60 Capsules) | Life Extension | 1,400mg carnitine blend / 2 capsules (1,400 mg) | $0.78 | None (NSF-registered facility) | Buy |
Registry check · L-Carnitine
Does anyone independently verify L-Carnitine supplements?
We did not find these products in the NSF, USP or Informed Sport registries. Yet 3 of them advertise “third-party testing” without naming the certifier that did it — wording no public registry can confirm or deny. A factory-level claim such as “cGMP” audits the plant, not the L-Carnitine bottle you would actually receive.
The 14 products on this page checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What L-Carnitine labels show
Priced per day, these L-carnitine products run $0.11 to $0.78 — a 7.1× gap between the cheapest and dearest L-carnitine here, across 10 brands.
Which row that favours is not obvious: Nutricost Nutricost Acetyl L-Carnitine (ALCAR) 500 mg (180 Capsules) is cheapest per serving at $0.11, but its serving sits below the median here, so part of that price gap is simply a smaller capsule.
Our Picks
Best Value: Nutricost Acetyl L-Carnitine (ALCAR) 500 mg (180 Capsules)
500mg acetyl-L-carnitine per 1 capsule (500 mg). None (NSF-registered facility). $0.11/day. 180 servings per container at $18.95.
Nutricost Acetyl L-Carnitine (ALCAR) 500 mg (180 Capsules) →
The shelf · L-Carnitine
Pack sizes differ 8.3×, so the shelf price tells you very little
Nature's Bounty L-Carnitine 500 mg (30 Tablets) holds 30 servings and BulkSupplements L-Carnitine L-Tartrate Powder, 1000 mg per serving (250 g) holds 250: the same shelf price buys 8.3× more of one than the other, which is why all 14 rows above are priced per day. On that basis Nutricost Acetyl L-Carnitine (ALCAR) 500 mg (180 Capsules) is the cheapest at $0.11 and Life Extension Optimized Carnitine, three forms incl. 300 mg PLC (60 Capsules) the dearest at $0.78.
Method: the 14 L-Carnitine products above, compared on label facts, serving size, servings per container, form, price. Not a dosing recommendation.
How these 14 L-Carnitine products were ranked
Not one of these 14 L-carnitine products could be confirmed in the NSF, USP or Informed Sport registries, so verification separates none of them and the ranking falls to cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever L-carnitine you buy. Full methodology.