The only side effect we expect to see from a mass gainer is weight gain! Gaining 15 - 20lb is not unusual within the first few weeks of taking a good quality mass gainer.
One potentially unwanted effect a mass gainer does have is fat gain. But it’s important to remember that having some body fat is essential to allow your body to produce the hormones needed to kick-start muscle growth.
Besides, that fat can be lost relatively quickly once you’re at the stage you’re ready to swap onto whey protein. If you’re the kind of person who struggled to gain fat in the first place, trust us, this won’t be much of an issue for you.
Because the mass gainers we’ve included here are food-based supplements, we don’t expect you to experience any adverse health-related side effects.
Of course, if you’re at all concerned for any reason whatsoever, do speak to your doctor before taking any new supplement.