DHEA is not available on the NHS or in this country, but it can be obtained via the internet, but only from reputable sources. There's a lot of rubbish out there. I am fortunate enough to be seeing an excellent therapist, who specialises in sexual medicine. I took it following her advice as I was not able to find anyone to prescribe testosterone. I was desperate as I didn't feel well enough to stay to travel to the USA to stay with my son. I took 100mg a day and began to feel better than usual after 2 weeks. Unfortunately, after 3 weeks, the good effects started fading. However, when I stopped taking them I went back to feeling absolutely terrible. My American daughter-in-law's aunt takes 200mg a day and feels wonderful. It think there is not enough known about DHEA, though lower amounts are recommended for libido. Didn't do anything for me in that area. I don't know if my experiences are useful as I may have other health issues that going to be investigated.