I'm sure this question is answered elsewhere but my research skills are currently inaccessible. I can see now that several vitamins (magnesium, cod liver oil, vit D and possibly others) are working for me. Holland & Barratt is really expensive. I suspect some of you have found a good online place for buying supplements? Can you recommend please? If you have shopped around and specifically know the cheapest places to get certain vitamins, please say. More details: - I prefer tablets to powders or liquids - means I can use my pill box organiser. - I'm in the UK. - Worried about delivery costs - maybe delivery costs mean it would be cheaper to buy elsewhere. I have a pharmacy close to my house, do you think they're just going to be the cheapest? This is the pill box organiser if you're interested: https://www.amazon.co.uk/gp/product/B076RVYDY8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 Made me so happy to get it this week. Really makes a difference - my sleep is all over the place so I never was quite sure if I'd taken a pill or not.