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
All 14 products sorted by cost per labelled serving (lowest first). Dose, certification, and pricing verified against NIH DSLD and manufacturer data.
Read the dose column before the price column. Servings in this category are not equivalent — they range from 500 to 1,500 mg per serving. A lower cost per day here can simply mean a smaller serving, so the cheapest row is not automatically the best value.
| Product | Brand | Dose / Serving | Cost / Day | Certification | 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 | 1000mg acetyl-L-carnitine / 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 acetyl-L-carnitine / 1 capsule (500 mg) | $0.15 | None | Buy | |
| Nutricost L-Carnitine Tartrate 1000 mg per serving (240 Capsules) | Nutricost | 1000mg acetyl-L-carnitine / 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 acetyl-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) | $0.24 | None | Buy | |
| BulkSupplements Acetyl L-Carnitine Powder, 1.5 g per serving (100 g) | BulkSupplements | 1500mg 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 | 1000mg acetyl-L-carnitine / 2 capsules (1,000 mg) | $0.38 | None | Buy | |
| NOW L-Carnitine Liquid 1000 mg, Citrus (16 oz) | NOW Foods | 1000mg acetyl-L-carnitine / 1 tbsp (1,000 mg) | $0.50 | 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 | |
| Biolor Propionyl-L-Carnitine (PLC) HCl (120 Capsules) | Biolor | 1000mg acetyl-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 | 1400mg acetyl-L-carnitine / 2 capsules (1,400 mg) | $0.78 | None (NSF-registered facility) | Buy | |
| Nature's Bounty L-Carnitine 500 mg (30 Tablets) | Nature's Bounty | 500mg acetyl-L-carnitine / 1 tablet (500 mg) | $0.85 | None | Buy |
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) →
How We Rank L-Carnitine Supplements
Every product is evaluated on three criteria:
- Cost per day. Not cost per pill or cost per bottle — what it actually costs per day at the product's labelled serving. Where a category's servings differ in strength we flag it above the table, because cost per day is only comparable when the doses are.
- Third-party certification. USP Verified, NSF Certified for Sport, and ConsumerLab Approved indicate independent testing for purity, potency, and contaminants.
- Bioavailable form. We prioritize products using the specific chemical form shown to be most effective in published research.
Rankings are not influenced by affiliate commissions. We earn the same commission regardless of which product you choose. Read our full methodology.
Personalize Your L-Carnitine Choice
Not sure which l-carnitine supplement is right for you? Use our free tools:
- DNA Supplement Analyzer — upload 23andMe or AncestryDNA data to check for genetic variants affecting l-carnitine metabolism. Runs entirely in your browser.
- Lab Results Interpreter — enter your blood test values to get personalized dosing recommendations.
- Supplement Stack Builder — build a complete protocol based on your age, sex, medications, and goals.
- Supplement Audit — already taking l-carnitine? Check if you have the right form and dose.
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