Cayenne is a crucial element of the MC mainly for it's ability to loosen mucous and stimulating blood flow. Do some research on the healing properties of cayenne. Some experienced folks have gone as far as describing the MC as a "cayenne delivery system".
Though Burroughs does not get specific if you do some research you'll find that the byword for cayenne is "the hotter the better" and that to have therapeutic properties it needs to be at least 90K HU (Heat units). Most regular cayenne is 40K or less.Dr Christopher and Dr Schulze are 2 of the better known proponents of the healing properties of cayenne.
Start slowly and increase it gradually. Most experienced folks use 1/4 tsp per per 10 oz drink.