I just started using henna. I have done 2 treatments. I followed my 1st treatment with the 2nd 3 weeks later. This means the next treatment will be next weekend. I said I would then move from every 3 weeks to monthly or every 6 weeks. I like the effects, but I do not think I will need to do it that often. I am trying to get the stronger hair effects and to hopefully coat the hair for a little added thickness. Next thing I am looking at for thickness is Mega-Tek and starting to research Ovation. I think based on the benefits of the henna so far, I will continue to henna. However, I will start spreading out the treatments.