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Our Members Asked:
Some websites claim that synthetic vitamin C in supplements may be a combination the active "L" form and the inactive "D" form of ascorbic acid. Is that true? Should I be concerned?
Reviewed and edited by Tod Cooperman, M.D.
Answer:
While it is true that only L-ascorbic acid (or L-ascorbate) is active, modern processes for manufacturing vitamin C for supplements produces only this form. So you would not get the "D" form from a supplement. For more information about vitamin C, including our tests and comparisons of supplements, see the Vitamin C Supplements Review >>Join today to unlock all member benefits including full access to all CL Answers and over 1,300 reviews.
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Related CL Answers (2)
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Spencer328
December 21, 2014This is typical of a virulent form of online marketing where promoters of new high-priced formulations try to justify their absurd pricing by making nonsensical negative claims about reasonably priced "standard" versions of the same supplement. The marketing is often cloaked in pseudo-scientific mumbo-jumbo and backed by spurious "studies" that are nothing more than paid advertisements in rubbish "journals" that have official sounding names but are not recognized by legitimate researchers. Caveat emptor and how.
Lawrence11284
September 18, 2016that's right.