Which strength of vitamin D should I take?
That depends on you. UK guidance suggests considering a supplement through autumn and winter; your GP can advise on the right amount and test if there is reason to.
Can I take too much vitamin C?
It is water soluble, so excess is passed rather than stored, though very large amounts can upset the stomach. 500mg suits most people.
Why should I be careful with zinc?
A sustained high intake interferes with copper absorption. Follow the pack and check whether your multivitamin already contains it.
What is NAC?
N-acetyl cysteine, a derivative of the amino acid cysteine. There is no permitted health claim for it, so we describe it rather than credit it with anything.
