No red flags. If you have any health problems whatsoever, you should speak with your doctor before taking any multivitamin. However, for most people, GNC Mega Men is unlikely to cause any sort of side effects. Other than the high levels of niacin, which, as we mentioned in the previous section can cause flushing in some, Mega Men's ingredients are fairly standard in a general multivitamin and are well-tolerated by most. Because of its high levels of B vitamins, it may cause urine to appear bright or fluorescent yellow an hour or so after ingestion. This is normal and is merely the body's way of ridding itself of unneeded vitamins. It is gluten-free, but not vegetarian as it contains fish oils.
There are a few major advances in protein shakes that the big companies are not investing in due to cost and raw material testing. Grass-fed over feed lot cattle is a must in order to avoid a GM corn fed animal along with steroids and hormones in the animal. Undenatured whey over denatured whey is a must for live enzymes and digestion. 20+ grams of protein with a full amino acid profile is a must for burning fat and building lean muscle (numerous studies) and a clean fat/fiber content. GNC simply does not offer a product like this but they are out there. I can tell you more if you are interested. Thanks for putting your heart and care into helping others!