Best L-Carnitine Supplements 2026: Cost per Effective Dose
Our 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 labeled) | 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 | |
| Jarrow Formulas Acetyl L-Carnitine 500 mg (120 Veggie Capsules) | Jarrow Formulas | 500mg acetyl-L-carnitine / 1 capsule (500 mg) | $0.27 | None | Buy | |
| NOW L-Carnitine 500 mg, Free-Form (60 Veg Capsules) | NOW Foods | 500mg L-carnitine / 1 capsule (500 mg) | $0.27 | None (cGMP) | 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) | $0.42 | None (cGMP) | Buy | |
| Thorne Acetyl-L-Carnitine 500 mg (60 Capsules) | Thorne | 500mg acetyl-L-carnitine / 1 capsule (500 mg) | $0.53 | 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?
1 of the 14 L-Carnitine products on this page is confirmed in NSF/ANSI 173: Thorne Acetyl-L-Carnitine 500 mg (60 Capsules). For the others, the listing may name a certification, but we did not find it in a public registry — that is not evidence against them, only an absence of independent confirmation.
Certification is not a dosing guarantee. Across the whole catalogue, certified products reach the clinically studied dose 57% of the time and uncertified ones 71% — a gap too small to mean anything (Fisher p = 0.185). Read the L-Carnitine dose column either way.
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 priciest L-carnitine here, across 10 brands.
Which row that favors is not obvious: 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 priciest 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
1 of these 14 is confirmed in a certifier's registry — the only L-carnitine row where the claim is independently backed — and the rest are ranked on cost per day at the labeled serving. Commission does not enter it: the rate is the same whichever L-carnitine you buy. Full methodology.