@wintersky, do you know any Rehmannia or Rehammnia 6 that's sold online that is cooked before its packaged.
This looks pretty decent: http://www.dragonherbs.com/prodinfo.asp?number=326 but I have no way knowing what I get. Or could I go for a pure formulas alcohol mix? https://www.pureformulas.com/rehmannia-1-oz-by-herb-pharm.html
The Dragon Herbs formula is an extract of a formula called Liu Wei Di Huang, which has cooked rehmannia (shu di huang) as its chief ingredient. Any product that's sold as Rehmannia Six is going to have cooked rehmannia. Raw rehmannia is labeled as sheng di huang.
The Herb Pharm tincture is also made from cooked rehmannia, but in general, I wouldn't recommend taking alcoholic tinctures of Chinese herbs. This tincture is a 1:5 ratio, which means that a 1-oz bottle is extracted from about 6 grams of dry herb. In Chinese medicine, rehmannia is used in larger doses, up to 60 grams per day! So using a tincture would not only be quite expensive but would require the ingestion of a significant amount of alcohol.
Personally, my favorite source for Chinese herb extracts is Treasure of the East, the American distributor for Tianjiang Pharmaceutical. I get them from Acupuncture Atlanta:
You can also buy bulk shu di huang if you're interested in making your own decoctions.