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Doctor's Best, Best Acetyl-L-Carnitine HCl, 588 mg, 60 Veggie Caps

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  • Shipping Weight: 0.18 lbs (0.08 kg)
  • Product Code: DRB-00105
  • UPC Code: 753950001053
  • Package Quantity: 60 Veggie Caps
  • Dimensions: 2.1 x 2.1 x 3.8 in, 0.15 lbs (0.07 kg)
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Product Overview


  • Science-Based Nutrition
  • Dietary Supplement
  • Biosint Carnitines
  • Featuring Sigma Tau Carnitine
  • Enhances Alertness & Mental Focus

Acetyl-L-Carnitine (ALC) is a naturally occurring form of L-Carnitine, a vitamin-like nutrient synthesized in the body, from the amino acids lysine and methionine. ALC plays a key role in the production of acetylcholine, an important neurotransmitter for brain and nerve cell function.

The Sigma tau supplied Acetyl-L-Carnitine in this product is derived from a base of pharmaceutical grade L-Carnitine manufactured by patented, FDA-approved process that fully complies with USP, FCC and EU monographs. It is pesticide-free and BSE safe.

  • Supports energy metabolism in the brain
  • Keeps nerves healthy and in repair
  • Decreases free radical production in the brain

Suggested Use

Adult Use: Take 1 to 4 capsules daily with or without food. Higher intakes may be beneficial, as recommended by a nutritionally-informed physician.

Other Ingredients

Stearic acid, cellulose, magnesium silicate, silicon dioxide, modified cellulose (vegetarian capsule).

Non-GMO and Gluten Free

Contains nothing other than listed ingredients.


Individuals with thyroid problems or on anticoagulant therapy should consult their physician before using this product.

Supplement Facts
Serving Size: 1 capsule
Servings per container: 60 servings
  Amount Per Serving: % Daily Value
(from 588 mg acetyl-l-carnitine HCI supplied by Sigma tau)
500 mg
†Daily Value not established.
iHerb Customer Reviews

Best carnitine supplement

Posted by 4958567946347066239 on Sep 07, 2016

I am taking this along with B-right and CoQ10. Results are impressive. Significant improvement in focus and energy.

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Definitely does something

Posted by 5390270480728900376 on Jun 23, 2016

This provides quite a strong mental sharpness and alertness which for me also gave some slight nausea. I also took around noon and found myself greatly alert all day and then couldnt sleep for much of the night. Half a capsule works much better for me. It also makes me feel like I have just been exercising I suppose since it apparently it increases the mitochondria activity in your cells. Doesn't do much for my autistic kid. Slight improvement in anxiety I think. Well at least it definitely does something unlike much of the iherb stuff. I'm not sure if its really that useful for solving any problem other than tiredness.

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Seems good for memory

Posted by 4875328750685686782 on Apr 12, 2016

Have been taking this (am 73 years old) for about3 months and it seems to be helpful.

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MOOD ENHANCER plus other benefits!

Posted by Angeleyes on Jan 06, 2015

I originally purchased this when our sons doctor suggested it for him. Our seven year old has autism and this has helped his focus and concentration. I started taking it for brain fog, mood swings and low energy. IT WORKS! I've only been taking one capsule per day and I can feel a major difference in my energy level and mind set. Overall, I feel more grounded, focused and less scatter brained. My mood is better, and there's much less yawning mid day for me. My husband started using this for low energy as well. Two capsules or even 3 seem a better fit for him. It took just 2-3 days for me to feel the effects. The only down side is if you forget to take one, or you run out for awhile, you will feel it! Highly recommend!

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Maybe I don't need them?

Posted by 4764755083682819352 on Jul 13, 2014

I've notice no difference in me, taking these. I'm trying a different brand/formula next.

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