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GNC Mega Men Review

By: Kelly Burgess on April 05, 2017

Bottom Line

Users give GNC Mega Men high marks, with few complaints of digestive upsets or other side effects; although a few report an aftertaste. In expert testing this multivitamin meets truth in labeling standards, earning an approved nod from one professional lab.


  • No iron
  • Easy to swallow
  • Passes independent testing
  • 50 percent of vitamin A as beta-carotene


  • Exceeds UL for niacin
  • Some report an aftertaste
Our Analysis
Read Amazon Reviews

Breaking it down

Key ingredients

Good for a vitamin D boost. GNC makes several formulations under the Mega Men label, including this fairly basic blend. It has a pretty standard combination of vitamins as recommended for men, including no iron, with slightly higher levels of vitamin D3 -- 1,600 IU. It's on the high side for B vitamins, and exceeds the recommend tolerable upper intake level (UL) for niacin, but that's not considered to be a dangerous or even unusual formulation -- although excess niacin can cause flushing, we did not read of any report of flushing in user reviewers. Mega Men puts a focus on antioxidants with a proprietary blend of fruits and vegetables. It has been certified by professional testing organizations for accuracy in labeling. Instructions say to take two capsules per day.

Side effects/contraindications

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.

Our Sources

Editors of ConsumerLab.com, Feb. 22, 2017

GNC Mega Men multivitamin is one of a wide variety of multivitamins tested by ConsumerLab.com in its latest review of multivitamin supplements. ConsumerLab.com tests for quality, accuracy in claimed ingredients and if a product meets FDA labeling requirements. Products are either approved or not approved.

Editors of LabDoor.com, Not Dated

GNC Mega Men is number eight overall and number eight for value. It receives an overall score of 81 out of 100; with its highest scores in product purity and nutritional value. Editors note that Vitamin B3 measured nearly 20 percent of the label's claim.

Contributors to Amazon.com , As of April 2017

In more than 630 customer reviews, GNC Mega Men earns an overall rating of 4.5 stars out of 5. A number of users say they started taking it after being diagnosed with low levels of vitamin D and that follow up tests have shown a marked improvement. The only complaints we saw were that it "doesn't work" for some (although they don't specify what they expected it to do), and that this supplement turns urine a bright florescent color.

Contributors to GNC.com, As of April 2017

There are just a few reviews of GNC Mega Men multivitamin at GNC's site, although there are quite a few for other formulations of this line. Still, the basic multi earns an overall rating of 4.7 stars out of 5, although users don't say much about it other than it has a powdery, flour smell.

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