According the the lab that seems to be owned by Mike Adams of Natural News, Gaia Organic herbs consistently comes up with the least heavy metal contamination of all the herbs he tested. Frontier, Starwest, and NOW come up the highest. I've been warning people about NOW for a while due to supplements not containing what they said they did.
I've been recommend Gaia Organics liquid herbal extracts for a while because I like their purity, quality, potency, and freshness as well as their methods of extraction/preservation. Their stuff is also more expensive and harder to find at a discount. If enough of us lobby Swanson's and Vitacost, they can carry more of this product.
You can see these lab results if you enter in a valid sounding email, even if it is at nowhere.com.
http://labs.naturaln...rbs-Ginkgo.html