What website offers info on drug, vitamin, mineral and supplement interactions

In My Humble Opinion
1

I have seen sites like this before but forget the URLs.

As an example copper and zinc compete to be absorbed, so too much of one could lead to a deficiency of the other.

Does it matter if you take minerals that are chelated to organic molecules (citrate, gluconate, etc) rather than inorganic chelates like oxide? Are those absorbed at different parts of the digestive tract?

2

One of many:

http://healthtools.aarp.org/drug-interactions?CMP=KNC-360i-YAHOOBING-HEA&HBX_PK=drug_interactions&utm_source=YAHOOBING&utm_medium=cpc&utm_term=drug%2Binteractions&utm_campaign=M_Health%2BTools&360cid=SI_194864521_320875578_1
~VOW

3

http://www.pdr.net/