--- title: "Modafinil vs L-Carnitine: Side-by-Side Comparison (2026)" url: https://www.bodyhackguide.co/compare/modafinil-vs-l-carnitine description: "Compare Modafinil vs L-Carnitine side by side. We earn a commission on some vendor links. Mechanism, half-life, dose range, side effects and prices." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) # Modafinil vs L-Carnitine Side-by-side comparison of Modafinil and L-Carnitine: mechanism, half-life, dose range, safety profile, and vendor pricing. Modafinil: no price on file L-Carnitine from $34.99 ## Price snapshot ### Modafinil Current low — 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ### L-Carnitine Current low $34.99 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ## Modafinil Modafinil is a prescription wakefulness-promoting agent approved by the US Food and Drug Administration in December 1998 under the brand name Provigil (Cephalon, now Teva) for the treatment of excessive daytime… No vendor price on file. Full Modafinil profile (https://www.bodyhackguide.co/compound/modafinil) ## L-Carnitine L-Carnitine is a naturally occurring quaternary ammonium compound synthesized in the body from the amino acids lysine and methionine, with essential cofactor roles in fatty acid metabolism, energy production, and… **Lowest listed price:** $34.99 across 4 listings Full L-Carnitine profile (https://www.bodyhackguide.co/compound/l-carnitine) ## Side-by-side comparison | Attribute | Modafinil | L-Carnitine | | --- | --- | --- | | Category | Nootropics | Weight Loss | | Research Stage | Preclinical | Preclinical | | Mechanism of Action | Modafinil's mechanism of action is genuinely incompletely understood despite more than two decades of clinical use and extensive preclinical research. It is not a classical stimulant — it does not produce the catecholamine surge of amphetamines, the direct… | L-Carnitine's mechanisms extend beyond the simple "fat-burning nutrient" label. Understanding these mechanisms helps predict where supplementation will and will not produce meaningful effects. The carnitine shuttle — core mechanism. The fundamental role of… | | Half-Life | — | — | | Typical Dose Range | — | 500 mg - 2000 mg daily (oral or injection) | | Dosing Frequency | — | — | | Administration | — | — | | Side Effects | Modafinil's side effect profile is relatively favorable compared to classical stimulants but is not negligible. The most common side effects, reported in 5-10% or more of users in clinical trials, are headache (dose-related, typically transient but… | L-Carnitine has an excellent safety profile across decades of clinical use, with most adverse effects being mild, dose-related, and self-limiting. Serious adverse events are rare. Gastrointestinal effects (most common). Diarrhea, abdominal cramping, nausea.… | | Molecular Weight | — | 161.20 g/mol | | Common Vial Sizes | — | — | ## Price History 3 data points - Half Nattys - Disguised Alpha ### Modafinil: potential benefits - No structured benefit list published. ### L-Carnitine: potential benefits - Enhanced fat metabolism - Improved exercise performance - Reduced muscle damage and recovery time - Neuroprotective effects (acetyl-L-carnitine) - Mitochondrial function support - Improved insulin sensitivity ## Frequently asked ### What's the difference between Modafinil and L-Carnitine? Modafinil is a nootropics that modafinil's mechanism of action is genuinely incompletely understood despite more than two decades of clinical use and extensive preclinical research. it is not a classical…. L-Carnitine is a weight loss that l-carnitine's mechanisms extend beyond the simple "fat-burning nutrient" label. understanding these mechanisms helps predict where supplementation will and will not produce…. The two differ in mechanism, half-life (not reported vs not reported), and typical dose range. ### Which has the longer half-life, Modafinil or L-Carnitine? Modafinil has a half-life of not reported. L-Carnitine has a half-life of not reported. Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Can you stack Modafinil and L-Carnitine? Stacking depends on mechanism overlap, safety profile, and goals. Modafinil and L-Carnitine should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Listings from the vendors we track. Prices change often, so check the vendor before you buy. Modafinil prices: https://www.bodyhackguide.co/compound/modafinil?tab=prices L-Carnitine prices: https://www.bodyhackguide.co/compound/l-carnitine?tab=prices Compare all compounds: https://www.bodyhackguide.co/compare ### Before you buy Modafinil or L-Carnitine Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor. View Vendor Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ## Related comparisons Modafinil vs Phenylpiracetam: https://www.bodyhackguide.co/compare/modafinil-vs-phenylpiracetam Bromantane vs Modafinil: https://www.bodyhackguide.co/compare/bromantane-vs-modafinil **Research use only.** BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. See editorial standards (https://www.bodyhackguide.co/editorial-standards) and affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). 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