I beta tested a testosterone booster for PES a few months ago. I didn't notice libido benefit but it had a very strong PDE5 inhibition effect (if you catch my drift).
One of the things which puts us off releasing one is that they seem to have more varied feedback than any other product category out there. Some people get on really well with a product that other people hate. There never seems to be a single product which unanimously delivers.
This makes me curious to ask for feedback. For everyone on here who has used natural testosterone boosters which was your favourite? Perhaps rank your top five so other people know which ones you have tried.