Great discussion of vitamin D. Just don't get carried away with promoting suppliers and prices.
Just so everyone knows (newer members), Imminst forums have had trouble with spam and viral marketers in the past. "Buy this, but that, wow - great prices here, great prices there, this supplier sucks, this supplier is great". Too much of this and posts will be deleted and accounts will be suspended.
Can't you merge those posts into a 'Mega' thread (one per supplement) in Suppliers Discussion.
That's how I would approach it.