I use garlic, onion and oregano in oil form. These are the strongest, safest anti-microbials I've been able to find in Peat's work.
I mix these (2 parts) with DMSO (6 parts) and urea (2 parts) (10 parts total), following this patent:
There is no smell of sulphur that anyone reports, though I'm around people quite a bit.
I find this is far more potent than carrot salad, and avoids the bulk from the carrot.
I think it's estimated that 3/4 of your serotonin is produced in the gut, and Peat describes how a vicious serotonin/endotoxin feedback loop can strike in an inflamed gut.
A germ-free gut combined with copious perspiration and very bright redlight seems to me to be the key to reducing gut serotonin, however you may achieve it, in turn boosting oxidative metabolism.