Manufacturers make convenience foods with -- in chemistry speak -- lots of sodium "salts, " from sodium citrate to sodium phosphate.

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All because I read a book called You: Staying Young, which advises taking large doses of calcium citrate two or three times a day.

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Yoon and other physicians now use magnesium citrate, which he said requires patients to drink less, is easier to tolerate and works just as well.

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Have you had the same results with calcium citrate?

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After experimenting with more than a dozen different formulations, drying them with custom-made machinery and heating them in ovens to test shelf life, Nektar hit upon a successful recipe that mixes insulin with glycine (an amino acid), citrate (the salt of an organic acid found in humans) and mannitol (a sugar used in intravenous products).

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