What percentage of active Phosphatidylserine will your product have? How many mg/dose? How many doses? How much will it cost?
PS is expensive at the doses you have to take for it to be effective. 60 pills for $30 (or more), with 100mg actual PS. 10 pills/day 6 days = $6.00/day.
Hopefully you've found a way to do this cheaper than that.
There are ways to lower cortisol naturally, by getting plenty of sleep and getting to bed early (unlike me now). Switch to a low to moderate carb diet and only take extra (LOW GI) carbs when you NEED them (of course you still take your high GI carbs immediately after w/o - which actually will help lower cortisol). Eat regularly (don't skip meals or wait too long to eat). Don't overtrain. And, relax bitches...use meditation or yoga or whatever works for you to chill the fuck out.
There are also supps like PS, Vit. C (a study showed Russian athletes I believe who took like a gram of C before and after workouts showed lower cortisol levels), Glutamine (some studies have shown it to reduce cort.), Acetyl-L Carnitine (shown in study in humans to reduce cort. and rats to elevate lh - leutenizing hormone - ).
Some companies produce herbal blends that have a variety of herbs believed to lower cort. packed into a pill. I've seen these priced at around $1/day, effectively.