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Information on the latest vitamin D news and research.

Find out more information on deficiency, supplementation, sun exposure, and how vitamin D relates to your health.

What does as Cholecalciferol mean on a product label. Some labels just state Cholecalciferol

Ask the Vitamin D Council

Asked by  ran2599dy on October 17, 2014

Vitamin D Council Answer

  • Jeff Nicklas
     Jeff Nicklas on


    There are two different forms of vitamin D, vitamin D2 and vitamin D3.

    Vitamin D2 is derived from plant sources and was the original form found in supplements. Vitamin D3 is the natural form that humans produce in the skin when exposed to sunlight.

    Cholecalciferol is another term for vitamin D3, while ergocalciferol is another term for vitamin D2. That is, when you see ‘cholecalciferol’ on a supplement label that means it contains vitamin D3.

    Answered by  Jeff Nicklas on

    • ran2599dy
       ran2599dy on

      I read somewhere that “as Cholecalciferol” was not as chemically pure as pure cholecalciferol. Not sure is this is true. I was also told that the FDA requires either AS or From on most vitamin D3 labels but nobody seems to know the difference. Any information would be helpful.

      Answered by  ran2599dy on