I'm not convinced that trib has any effect in either of those areas.........what it will do is counteract suppression in higher doses, so I do like it for that. If you're really wanting to to keep gains and and continue to add muscle during your post cycle therapy (pct), you're going to need more than tribulus.
Sarmsearch OSTA works VERY well for that purpose - most people will tell you that OSTA is a staple for PCT.