FAT METABOLISM & MITOCHONDRIAL ENERGY
30-day supply
Key Benefits
Supports fat metabolism and energy production
Promotes exercise performance and recovery
Supports mitochondrial function
May improve oxygen utilization during exercise
Wellness Goals
Recommended Dose
500mg
Take one 500mg capsule daily. For exercise performance, take 60-90 minutes before training for peak availability. Carnitine absorption is enhanced when taken with carbohydrates, so taking it with a meal works well.
Get your personalized dose3rd Party Tested
Doctor Formulated
cGMP Certified
The Details
Your body is sitting on an enormous reserve of stored energy in the form of fat, but accessing it efficiently requires a transport system. L-Carnitine is the shuttle bus that moves fatty acids across the mitochondrial membrane so they can be burned for fuel. Without enough carnitine, fat just sits there unused.
This makes carnitine particularly valuable for anyone focused on body composition or endurance performance. Studies show it improves fat oxidation during exercise, enhances oxygen utilization, and reduces lactate accumulation — meaning you can train harder and recover faster. It's one of the few supplements with genuine evidence for improving both fat burning and exercise capacity.
Carnitine also has impressive recovery benefits. Research demonstrates it reduces markers of muscle damage, decreases soreness after intense exercise, and supports faster return to baseline performance. Your body produces some carnitine on its own, but production declines with age, and vegetarians/vegans typically have lower levels since carnitine is found primarily in red meat.
Research
Key studies supporting Carnitine, from peer-reviewed journals.
Acetyl-L-carnitine supplementation and the treatment of depressive symptoms: a systematic review and meta-analysis — 2017
Effects of L-carnitine supplementation on weight loss and body composition: a systematic review and meta-analysis of 37 randomized controlled clinical trials — 2020
Study titles are simplified for readability. Provided for informational purposes — not medical advice.
Transparency
Every batch is independently tested by ISO-17025 accredited labs for purity, potency, and contaminants.
Designed by healthcare professionals using evidence-based research and clinical expertise.
Manufactured in cGMP & UL certified, FDA-registered facilities with a flawless inspection record.
As with any natural health product, consult your healthcare practitioner. Store in a cool, dry place. Keep out of reach of children. Discontinue use immediately if you experience an adverse event.
What people say
Really good supplement brand. The daily pack format is so convenient and I've been 100% consistent because of it. The quiz was genuinely thorough. Knocked one star off because I'd love the option to add or remove individual supplements as I learn more about my body.
I've tried so many supplements and honestly nothing has worked like this. The quiz is actually thorough and the results show it. Energy is UP, recovery is UP, sleep is SO much better. Can't believe it took me this long to find this brand.
Three weeks in and I already feel the difference. My morning energy is COMPLETELY different. No more dragging myself out of bed. The personalization through the quiz is what makes it work — it's not just a generic multivitamin. Stack actually thought about what MY body needs.
I've been on a health optimization journey for about three years and have tried what feels like every supplement brand on the market. Most of them are either generic multivitamins dressed up in pretty packaging, or they're so specific that you need to be a nutritionist to understand what you're actually taking. Stack sits in a completely different category. The quiz is the first thing that impressed me. It asks genuinely intelligent questions — not just 'how old are you and what's your gender' but questions about your diet, your sleep patterns, your stress levels, your exercise frequency. It felt like a real consultation rather than a data collection exercise. The pack that arrived was clearly personalized to my answers. After six weeks, the improvements have been consistent and measurable: better sleep quality, more stable energy throughout the day, and noticeably faster recovery after my runs. My partner commented that I seemed more 'on' in the evenings rather than crashing after dinner. The daily pack format is brilliant for compliance — I've been 100% consistent because the habit is so frictionless. One pack, done, every morning. No bottles, no measuring, no forgetting half of them. Genuinely one of the best health investments I've made.
My focus at work has been sharper and I'm waking up without that groggy feeling I used to have every morning. Told two friends about Stack already. Customer support was also really helpful when I had a question about one of the ingredients.
honestly wasn't sure about it at first but three weeks in and i'm so glad i tried it. energy is way better, i'm sleeping properly for the first time in months. the quiz was really detailed which gave me confidence it was actually personalized. would 100% recommend.
Personalized for you
Take our 2-minute Health Assessment and let our AI build your personalized stack — every supplement chosen for your specific goals.
Take the Health AssessmentProduct images are for illustrative purposes and may not represent actual packaging.
