Though the NHS is pretty sceptical about the use of vitamin C, garlic, or echinacea supplements to prevent or speed up recovery from colds, they do reccomend all adults “consider taking a daily vitamin D supplement during the autumn and winter”.

That’s because our body doesn’t make enough of the stuff in the darker months as sunlight decreases. Vitamin D is key to keeping our bones, teeth, and muscles healthy, and can help to keep our immune system in good nick.

But a recent review published in Nutrition Reviews suggested that not all vitamin D supplements are created equal.

In fact, they write, vitamin D2 might actually reduce the vitamin D type linked to better immunity, giving the opposite effect than that for which many of us purchase the supplement.

Why might vitamin D2

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