Thank you. A good starting place is to go to a store that sells vitamins and supplements. Most (not all) of the people that work there are very well versed in this subject. I'd suggest going to a local place that's been there for a while. Also, the small one- person owned shops are the best. These are the people who have devoted lots of time, energy and money are healthful living. Good luck, what we need is out there and it does not involve big pharma.