Alerts

FDA advises consumers to stop using any supplement products labeled as OxyElite Pro or VERSA-1. Please see the following advisories: FDA -10/08/13, FDA - 10/11/13 and CDC - 10/08/13.

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New article on reporting side effects of supplements
Just published in The New England Journal of Medicine: A recent article brings up dietary supplement issues you need to be aware of and discusses how dietary supplement side effects could be monitored better. A PDF of the April 3rd article is available free online.

3rd International Congress on Soldiers’ Physical Performance
August 18-21, 2014
The ICSPP delivers innovative scientific programming on soldiers’ physical performance with experts from around the world.

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Dietary supplement module
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You are here: Home Dietary Supplements OPSS: Operation Supplement Safety OPSS: Operation Supplement Safety OPSS Frequently Asked Questions (FAQs) What’s the difference between caffeine and caffeine anhydrous?

Question

What’s the difference between caffeine and caffeine anhydrous?

OPSS Answer

The difference has to do with the amount of water associated with the caffeine molecule. The term "caffeine" can refer to any form of caffeine, regardless of its water content. “Caffeine anhydrous" has essentially no water—just 0.5%. For this reason, logic and chemistry suggest that anhydrous caffeine is more potent. The anhydrous form could also be more potent because, according to some evidence, the body may absorb it more readily. For all intents and purposes, however, caffeine and caffeine anhydrous are synonymous.

The form of caffeine that appears most often on dietary supplement labels is caffeine anhydrous. Other names for caffeine include 1,3,7-trimethylxanthine and methyltheobromine but caffeine in dietary supplements can come from “hidden” sources too. For more information, read the OPSS FAQ about hidden sources of caffeine.

The Food and Drug Administration (FDA) requires food and dietary supplement manufacturers to identify caffeine in the ingredient list of a product that contains added caffeine in any form. And for information about caffeine in dietary supplements, please visit our FAQ “How much caffeine is safe?

FAQ updated 25 February 2014.

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