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5 microgram is the recommended daily intake of vitamin D, 25 was used in some clinical trials. ike with any chemical, the dose is important and there's a sweet spot between "does nothing" and "harmful".
I picked my supplements based on reading around, for example fish oil -can- work against high blood pressure...or not. Even trials give mixed results for supplements.
Without some taking some measurements yourself it can be hard to find out if it works for you.
The vitamin B supplement gives us no extra energy so probably waste of £... though harmless. But we are not running any (of course not free...) blood level analysis along it to see if "invisible" metrics improve.
Of course there's lots if bs around supplements. Some sites recommend ultra high vitamin D doses which which definitely recommends against.
And vitamin C does nothing for me to prevent colds though berocca makes them slightly less grim. But...you should not take berocca all the time potentially due to high zinc doses. It's a minefield 😁
I'll see if I can find that Which tx :)
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JWestland
Stonehedge
There is an article in this months Which magazine about supplements. They have a list of vitamins that are proven to work and ones that aren't proven by medical studies to work.
Was suprised to see that there is no evidence that eating glucosamine supplements leads to more glucosamine being made available to joints. Loads of people swear by it but there is vanishingly little evidence to support efficacy.
Edit: There was also a fairly sobering warning about taking too much Vitamin D. Aparently more than 100ug per day over a period if time can weaken bones and damage your heart and kidneys.