Could be orange chromhidrosis. I've had it before - when I've had too much carrot juice. Last time I thought it would be a good idea to drink about 2L (half gallon) of fresh carrot juice. 20+ carrots hitting the body all at once is not a good idea.
Another possibility is your multi-vitamin - if it's not timed release or if it's got like 1000% of the daily recommended limit of the B family, your body will excrete what it can't process - it'll come out in urine or sweat. I've had that happen, too.
(I don't see the protein powered having any influence)