I ate some inositol last night for the first time. I really didn't measure the amount accurately, I think I ate about 10-15 grams before bed. So I can't say how much it helped from this one time, I think it may have made me calmer but its too early to make a good judgement on the effiency it had on me.
I bought 300 grams for I think 9 dollars( I forgot exactly) from beyond-a-a-century.com