• Dr Campbell has got good advice too.

    Take vitamin D3 to optimise your immune system.

    That vijeo´s too long. How much should I take?

  • Depends on the colour of your skin and where you are in the world

  • My son who is 5, with stage three chronic kidney disease, has two drops per day.

    I don't know what that scales up to as an adult, but I don't think you can overdose on it.

    He also has three drops of alfacalcidol which I think is similar.

    He used to have EPO injections, so he had better be a decent cyclist when he is older

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