The scientific definition of a crystal is based on the microscopic arrangement of atoms inside it, called the crystal structure. A crystal is a solid where the atoms form a periodic arrangement. (Quasicrystals are an exception, see below.) Not all solids are crystals.
After examining the impact of 6gm dose of turmeric on the insulin levels, plasma glucose, and the glycemic index in almost 14 fit people, the study found that the intake of turmeric did not affected the glucose level, but helped in increasing the level of insulin.owever, there are doctors who usually prescribe 500 mg of turmeric supplements that are to be taken three times daily. Although this prescription can be a good suggestion to begin, it is not recommended to start following this prescription without consulting your own doctor.
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!!