L-Carnitine L-Tartrate

Performance · Evidence: Mixed · Importance: Low

Marketed for fat metabolism; may support recovery markers in some contexts.

What the evidence says

Mixed. Some evidence for recovery markers. Fat-loss claims are overstated.

Typical dose & timing

Dose: 1–3 g/day

Timing: Daily with carbs or a meal.

Role in a stack

Optional advanced supplement.

Redundancy check:

Cautions & safety

GI side effects and fishy odor possible.

GI side effects possible at higher doses.

Best for

advanced users after basics are covered

Source-verified products

Real products in this category, ordered by review count. Each price and rating comes from the product's own page, recorded 2026-07-29 — follow the link for current values. Links go to the product's source page and never affect this ranking.

• NOW Foods, Acetyl-L- Carnitine, 50 Veg Capsules (500 mg per Capsule)
  NOW Foods · $10.40 · 4.8/5 (22726 ratings) · budget tier
• MRM Nutrition, Acetyl L-Carnitine, 60 Vegan Capsules
  MRM Nutrition · $13.99 · 4.7/5 (19670 ratings) · budget tier
• EVLution Nutrition, L-Carnitine500®, 500 mg, 120 Capsules
  EVLution Nutrition · $14.99 · 4.7/5 (6305 ratings) · budget tier
• Doctor's Best, Acetyl-L-Carnitine, 120 Veggie Caps (500 mg per Cap)
  Doctor's Best · $22.99 · 4.7/5 (3872 ratings) · premium tier
• California Gold Nutrition, Acetyl-L-Carnitine, 500 mg, 60 Veggie Capsules
  California Gold Nutrition · $18.19 · 4.7/5 (3476 ratings) · mid tier
• Nutricost L-Carnitine Tartrate Capsules
  Nutricost · $16.97 · 4.32/5 (336 ratings) · budget tier
• Nutricost Acetyl L-Carnitine Capsules
  Nutricost · $20.97 · 4.33/5 (257 ratings) · mid tier
• LeanShots Liquid L-Carnitine Shot (3000mg)
  NutraBio · $29.99 · 4.8/5 (72 ratings) · premium tier
• Acetyl L-Carnitine
  Momentous · $26.95 · 4.7/5 (54 ratings) · premium tier
• Acetyl L-Carnitine (500mg)
  NutraBio · $19.99 · 4.9/5 (15 ratings) · mid tier
• JYM L-Carnitine L-Tartrate
  JYM Supplement Science · $19.99 · 4.9/5 (9 ratings) · mid tier
• Acetyl L-Carnitine Powder
  Carlson · $33.50 · 4.6/5 (5 ratings) · premium tier

References

• L-carnitine supplementation and exercise performance: a meta-analysis. PLOS ONE (2020)
  Evidence is mixed. L-carnitine may support recovery markers in some contexts. Fat-loss claims are largely overstated. Most benefit is seen with co-ingestion with carbohydrates.