What is the role of Phosphatidyl Serine in the methylation protocols?

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I'm following Dr Sarah Myhill's Methylation Protocol which includes Phosphatidyl Serine but I'd like to understand how it aids the methylation protocols. She advocates taking two a day but it is very expensive, and obviously I will start low and slow anyway.

I have already bought some and I'd like to know what to expect when taking it - more or less detox/die off/low potassium or other nasty side effects?

TIA :)
 
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