This thread is old, but for those mining the forum for information on PEA...
My early doses were 150-300mg/day, fractions of the 600mg PEA lozenge from Life Extension. These produced a relaxed "bliss" feeling I've sometimes felt with CBD, but also might've been responsible for a bad brain fog -- like, I struggled to read sentences. I don't know for sure PEA was responsible for this -- it's not like MCAS needs help to produce that kind of craziness -- but it may have been.
I started experimenting with smaller and smaller dosages. Eventually I discovered that when I haven't taken it for awhile, and then take even a mere 4mg, I reliably get that bliss feeling. But then a sort of hangover ensues for 1-2 days (marked by a strong headache and 'blah' feeling).
If I persist that dosage a few days, the hangover goes away, but so does the bliss. I've then raised as high as 36mg/day, but no longer feel anything from it.
Then several days ago, I quit cold turkey, and I'm now experiencing what might be a PEA withdrawal (headache and disrupted sleep).
So I seem to have a crazy sensitivity to small dosages far below the standard ones. I can only speculate as to why. PEA also has negative effects for me.
I also can't tell that taking PEA chronically has helped in terms of preventing an MCAS reaction. Admittedly, I'm taking doses far below the norm.
OTOH, when I instead took that 4mg episodically -- after a reaction had begun, but when I had not been taking it chronically (which would block the effect due to apparent tolerance) -- the relaxed bliss feeling it brings on may be helpful. It didn't stop the attack. But since there seems to be a relationship between the stress response and how your body learns to persist MCAS (i.e., limbic kindling), anything you can do to calm your body in that context seems like a good thing. I had occasions where I was struggling to keep myself from panicking during an attack, and the PEA was absolutely the difference in helping me calm down.