Gnc Mega Men Vitamin Side Effects Both Common And Rare

  references & resources
  
      Linus Pauling Institute: Vitamin B6
    
      The Ohio State University: Long-Term, High-Dose Vitamin B6/B12 Use Associated With Increased Lung Cancer Risk Among Men
    
      GNC
    
      National Sanitation Foundation
    
      Cleveland Clinic: "8 Vitamins & Minerals You Need for a Healthy Immune System"
    
      Mayo Clinic: "Antioxidants"
    
      Journal of Gastrointestinal Oncology: "Diet and supplements and their impact on colorectal cancer"
    
      National Institutes of Health: "Calcium and Vitamin D: Important at Every Age"
    
      The Journal of the National Cancer Institute: "Baseline Selenium Status and Effects of Selenium and Vitamin E Supplementation on Prostate Cancer Risk"
    
      National Institutes of Health: "Selenium"
    
      JAMA: "Efficacy of Folic Acid Therapy in Primary Prevention of Stroke Among Adults With Hypertension in China The CSPPT Randomized Clinical Trial"
    
      EWG: "How Much Is Too Much?"
    
      U.S. Pharmacopeia: "Services"
    
      Mayo Clinic: "Vitamin B12"
    
      StatPearls Publishing: "Vitamin A Toxicity"
    
      Harvard Health Publishing: "Getting your vitamins and minerals through diet"
    
      National Institutes of Health: "Vitamin D"
    
      National Institutes of Health: "Vitamin B12"
    
      Nutrients: "Dietary Sources of Lutein and Zeaxanthin Carotenoids and Their Role in Eye Health"
    
      Cleveland Clinic: "The Best Time to Take Vitamins"
    
      National Institutes of Health; Vitamin A and Carotenoids; April 2006
    
      "PNAS"; Antioxidants Prevent Health-Promoting Effects...; M. Ristow et al.; May 2009
    




GNC Mega Men Vitamins come in a variety of formulations to support health.

Image Credit: Thana Prasongsin/Moment/GettyImages

Image Credit: Thana Prasongsin/Moment/GettyImages

• What Is GNC Mega Men?
• Benefits
• Side Effects
• Who Needs Vitamins?
• Are They Safe?

Here at LIVESTRONG.com, we use deliberate language when it comes to sex and gender, but because manufacturers still sell vitamins marketed to men and women, we’ve used those terms throughout this article. Men’s and women’s vitamins are different in that they are made based on the recommended daily value (DV) of nutrients as designated by the USDA for people assigned male or female at birth.

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Image Credit: GNC

Image Credit: GNC

5 Red Flags That a Supplement Is Unsafe or Ineffective

Taking B vitamins with food could help prevent upset stomach, according to the Cleveland Clinic.

To prevent any adverse reactions, stick to the daily recommended dosage as listed on the label. Always consult your doctor before starting any dietary supplement, including anything from the GNC Mega Men line.

A quick chat with your doctor will determine whether these vitamins are right for you, along with directions on how to take them safely.

      Linus Pauling Institute: Vitamin B6
    
      The Ohio State University: Long-Term, High-Dose Vitamin B6/B12 Use Associated With Increased Lung Cancer Risk Among Men
    
      GNC
    
      National Sanitation Foundation
    
      Cleveland Clinic: "8 Vitamins & Minerals You Need for a Healthy Immune System"
    
      Mayo Clinic: "Antioxidants"
    
      Journal of Gastrointestinal Oncology: "Diet and supplements and their impact on colorectal cancer"
    
      National Institutes of Health: "Calcium and Vitamin D: Important at Every Age"
    
      The Journal of the National Cancer Institute: "Baseline Selenium Status and Effects of Selenium and Vitamin E Supplementation on Prostate Cancer Risk"
    
      National Institutes of Health: "Selenium"
    
      JAMA: "Efficacy of Folic Acid Therapy in Primary Prevention of Stroke Among Adults With Hypertension in China The CSPPT Randomized Clinical Trial"
    
      EWG: "How Much Is Too Much?"
    
      U.S. Pharmacopeia: "Services"
    
      Mayo Clinic: "Vitamin B12"
    
      StatPearls Publishing: "Vitamin A Toxicity"
    
      Harvard Health Publishing: "Getting your vitamins and minerals through diet"
    
      National Institutes of Health: "Vitamin D"
    
      National Institutes of Health: "Vitamin B12"
    
      Nutrients: "Dietary Sources of Lutein and Zeaxanthin Carotenoids and Their Role in Eye Health"
    
      Cleveland Clinic: "The Best Time to Take Vitamins"
    
      National Institutes of Health; Vitamin A and Carotenoids; April 2006
    
      "PNAS"; Antioxidants Prevent Health-Promoting Effects...; M. Ristow et al.; May 2009