My point is that powdered PS can be much higher than 50% in strength. Here's some more that are just 100mg of pure PhosphatidylSerine that are not softgels

https://www.amazon.com/NOW-Phosphatidyl-Serine-100mg-Capsules/dp/B0013OXFTU

https://www.amazon.com/Doctors-Best-Phosphatidyl-Serine-120-Count/dp/B0036FWOJQ