>you usually have noticeably different colored urine. That's no coincidence.
Personally the only substance I've noticed cause substantial colour changes is high doses of riboflavin (the infamous neon yellow...).
Several of the vitamin B's are often found in energy drinks and various pre-workout mixes in very high doses as well (e.g. it's not uncommon for pre-workout mixes to trigger niacin-flushes as well as riboflavin-neon color). The motivation seems to be that the potential benefits might be good enough and the risks low enough that it's better to dose high and maximize what is available to the body, even if most ends up being excreted.
Not many other supplements tends to be dosed at such high multiples of RDA's as some of the B-vitamins often does.
Personally the only substance I've noticed cause substantial colour changes is high doses of riboflavin (the infamous neon yellow...).
Several of the vitamin B's are often found in energy drinks and various pre-workout mixes in very high doses as well (e.g. it's not uncommon for pre-workout mixes to trigger niacin-flushes as well as riboflavin-neon color). The motivation seems to be that the potential benefits might be good enough and the risks low enough that it's better to dose high and maximize what is available to the body, even if most ends up being excreted.
Not many other supplements tends to be dosed at such high multiples of RDA's as some of the B-vitamins often does.