I'm looking to buy some Vit D3 for winter. Anyone advise me on strenght I should be taking please? I'm also looking to buy a new duvet, the one I have has just about had it lol... Don't want one with duck n down as I heard this isn't good for someone with breathing problems. Anyone else heard this? I know I can get alot of the info I need on the internet, but, I would rather ask people who have the same condition as me and may just have some helpful info for me. Thank you.