Phos serene (main ingredient in PP's Endoamp) works exceedingly well, but is spendy.
I bought some bulk powder which I keep in the fridge as it does degrade quicker, otherwise. This worked out much
cheaper than buying products that contained it. You could add some lecithin and then you would pretty much have something similar to Endoamp.
Phos Serine 340mgs ed or 800mgs pre workout to control cortisol from intense training.
Don't dose over 2400mgs a week or your joints will scream with pain, (mine do).
Phos Serine has cognitive benefits and aids restful sleep.
A much cheaper option to reduce cortisol is magnesium citrate @ 450mgs. (If I wake up to early I take 450mgs with one of those fizzy orange vitamin C tablets and easily sleep for two more hours. Try it, it works and it's very inexpensive.
More than 450mgs Mag cit and you may have horrible diarrhoea (had to look up the spelling., lol).
I only take Mag Cit on a empty stomach.