Now, I have been going through here and other forums ....I dont see anyone using Dr Greens..
Theres many posts in the DT forum from those who have used Dr Greens synthetic. The Search button is your friend.

I have had it now for at least 2 months. Should I be worried because it is really not a popular product?
If youre concerned about the efficacy of the synthetic, you can always test it with a validity test strip to see that the constituents (creatinine, pH, S/G, etc) are still within acceptable limits. These kits are inexpensive and are found online by doing a Google search for "drug adulteration test kits".