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The original was posted on /r/cfs by /u/Economist-Character on 2024-09-20 12:42:27+00:00.

Just a heads up for people looking up this supplement in the future

L-Arginine does not go well with MCAS!

It stimulates the mast cells to release histamine which is bad. The studies say to use it together with vit C, probably to reduce the histamine release, but I still got a rash and poisoned feeling

Just thought I’d get the information out there so none of my fellow MCASers waste 50€ on 4 months worth of poison 🥲

EDIT: It also made my canker sores flare up!

While it’s known that it’s problematic for herpes and cold sores (also herpes) I didn’t read anything about canker sores (not herpes) 🤷