Phosphatidylserine - spy free?

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I am very interested in trying phosphatidylserine for its regenerative effect on nerve cells, but suspect I am allergic to soy. Are there any reputable brands that are derived from sources besides soy? Thank you all.

I'm not sure, but you might find an answer searching this sight.

http://www.nutraingredients.com/

I've tried it, mainly that I wanted it for the cortisol busting effect. However, one of the side effects can be difficulty breathing - apparently I'm very allergic.