Sustain Alpha and Alpha Gel are both great products.
I can't speak for and don't know the dosage of Resveratrol in Sustain Alpha, but I'm good friends with the owner of Iconic and its a popular product and has been for years.
Alpha Gel is a great product and don't look at it as only for Resveratrol just bc you're on HRT. We have a lot of people on TRT that use Alpha Gel along with it to help with their libido and erection quality. We even have one HRT clinic now that refers people to use it with their HRT if they need extra help with libido.
Alpha Gel contains 7,8 Benzoflavone, Trans Resveratrol, Tongkat Ali (the good stuff, the Bionutricia extract std. to min 2% Eurycomanone), and Amentoflavone which is great for erections.
Here's the thread on Alpha Gel where you can read more feedback:
Natural Testosterone & Libido Support Lean Muscle & Performance Gel Alpha Gel contains ingredients that are commonly used to support an increase in natural testosterone levels and a reducing/balancing effect on estrogen levels in order to support lean muscle, strength, improved performance...
anabolicminds.com