Honestly, I do not remember. A few years have elapsed. I did not do so in any thoughtful way - there was a supplement in pill form and I took it in the evening. Pretty much the only time in my life I self-medicated with something. I would say just observe how it makes you feel, keep a diary? At least out of curiosity rather than caution. If you find it makes you feel better then that's great. (Of course subjectivity is a problem in this case).