The main question isn’t which androstenone product, but how much you need to optimize your phero signature. It’s very easy to OD, especially for younger men with high natural output. I prefer NPA, but have also used Androtics Experimone androstenone with good results. All androstenone products have worked great for me once I mastered dosage.
A weaker product like Turn Up The Heat, The Edge or 2.5mcg Experimone androstenone is best for those preferring to apply directly to skin. If you prefer mixing with cologne (e.g., 5:1 cologne to pheromone), a highly concentrated product like NPA is the ticket.
Whatever you do, cover well. It smells like cat pee and bad armpit.
Gegogi gave some really good advices and also list the product with androstenone.
But just keep in mind that “high concentration” for androstenone will be 2.5 mcg, very high will be 5 mcg. THose two are considered very low for most other pheromones.