It is not my usual practice to tell a specific brand/dose I use of any medication or supplement, but in this case,the brand was recommended by my pain rehab clinic doc and pharmacist. I use Swanson Curcumin Complex (curcumen longa extract) 300 mg and peperine (black pepper extract) 50mg. Black pepper makes curcumin be absorbed more readily. My dose is 300mg 4x day, but that is with my doctor's concurrence. If you use it on your own, 900mg/day is the recommended maximum. I usually buy directly from Swanson.
If I buy supplements on Amazon, I always make sure they are from the originator (eg Swanson) or Amazon itself and not from a reseller. Otherwise there is reportedly a risk of counterfeits.
Sue