Supplementing MC with allowable extracts

I'm on day 7 of 30 of The Master Cleanse (MC), and it's going very well ... however, now I want to push the envelop by supplementing my strict Master-Cleanse protocol with certain extracts or supplements which will not interfere with the sanctity of the MC.

I am considering adding one or more of the following:

-- Grapefruit seed extract (GSE)
-- Garlic extract (or other forms of garlic)
-- Oil of Oregano (Oreganol)
-- Diatomaceous Earth (DE)
-- Wormwood + Black-Walnut + clove (Clarkia)
-- Wheatgrass

I've already experimented with the Wormwood , DE, and Oreganol, and none of these appear to conflict with the Master-Cleanse in any noticeable way (but I'm not absolutely positive). Can anybody comment on these?

Also, does anyone know of a list of extracts / supplements that are known to not conflict with the MC?