Well hello Mike!
Your buddy must really like you if he told you about this place 
Many people keep it as their own little secret.
There are a shit load of great combos, but each of them is great for specific situations and when used by specific people. To help us make recommendations for you - can you give us an idea of your age, what situations you would use the pheromones, and what you would like to achieve? For example - are you mainly talking about picking up girls at bars or something else?
Also read up here;
that’ll help you to understand what we’re talking about.