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Guide to Abbreviations and Measurements

Most vitamins are measured in milligrams or micrograms. Vitamins A, D and E used to be measured in International Units (IUs) however can also be measured in mcgs or mgs. 

1 gram (g) = 1,000 milligrams (mg) = 1,000,000 micrograms (mcg)

1 mcg of Retinol (1mcg RE) = 3.3 IUs of Vitamin A

1 mcg RE of Beta-Carotene = 6 mcg of Beta-Carotene

100 IUs of Vitamin D = 2.5 mcg

100 IUs of Vitamin E = 67 mg

The best form of amino acids are the 'L-' form for example l-glutamine, l-lysine. Throughout this site we refer only to the amino acid name for example glutamine or lysine. When you buy a supplement do however check you are getting the l- form.


All supplements should be kept out of reach of infants and young children.

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