So how much curcumin should your turmeric powder have? Okay, coming to the key question. A turmeric powder having more than 2.5% is good but if you have choice prefer the one with atleast 3%. Any brand having more than 4% is really good. But do not lose your sleep over a lower curcumin percentage. Here is why (pardon me for using some math here): Typical dosage of turmeric is 5 gms (1-1.5 tsp) . So if your powder has 4% curcumin, in weight terms you will take 0.2 gms of curcumin. If your powder has 3% then taking 5 gms will give you 0.15 gms of curcumin. What if you take 6.5 gms of 3% powder? Then you get 0.195 gms. Almost same as 4% one!!