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Does B12 help you lose weight?

There's no solid proof that vitamin B-12 shots, also called injections, help you lose weight. Vitamin B-12 is a water-soluble B complex vitamin. It's found naturally in many foods, such as meat, fish and dairy products. Vitamin B-12 is added to some foods and is available as a dietary supplement.

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Are vitamin B-12 injections helpful for weight loss? Answer From Brent A. Bauer, M.D. There's no solid proof that vitamin B-12 shots, also called injections, help you lose weight. Vitamin B-12 is a water-soluble B complex vitamin. It's found naturally in many foods, such as meat, fish and dairy products. Vitamin B-12 is added to some foods and is available as a dietary supplement. Health care providers commonly prescribe vitamin B-12 shots to help prevent or treat pernicious anemia and B-12 deficiency. Some researchers have studied vitamin B-12 to find out if it can raise energy and endurance during exercise. But there isn't evidence to prove this. And unless you have low vitamin B-12 levels in your body, vitamin B-12 shots aren't likely to give you more energy or improve your performance. Metformin (Fortamet, Riomet, others) is a drug that may be used as part of a weight-loss tool for people with type 2 diabetes. Low vitamin B-12 levels in your body can be a side effect of this drug. If you take metformin, talk to your health care provider about ways to keep enough vitamin B-12 in your body. Getting large amounts of vitamin B-12 through vitamin B-12 shots is not likely to harm your health. But vitamin B-12 may affect how well some drugs work. And some drugs can affect vitamin B-12 levels. So if you want to get vitamin B-12 shots, tell your health care provider first. If you're hoping to lose weight, avoid giving in to quick and easy fixes. What counts is a healthy lifestyle. Enjoy healthier foods in proper portions. And get physical activity every day. There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. From Mayo Clinic to your inbox Sign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health. Email ErrorEmail field is required ErrorInclude a valid email address Learn more about Mayo Clinic’s use of data. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Subscribe! Thank you for subscribing! You'll soon start receiving the latest Mayo Clinic health information you requested in your inbox. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry

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Does fish cause weight gain?

Remember, fatty fish is still fatty. While the omega-3 fatty acids have lots of benefits, they're also high in calories. You'll gain weight if you overeat these fish. Most Americans, however, don't even eat the recommended 8 ounces a week.

The term "fatty fish" may sound unappealing, but actually these are the tastiest and healthiest foods from the sea. Oily fish such as salmon, tuna, sardines, mackerel, and trout are full of omega-3 fatty acids -- good fats unlike the bad saturated fat you find in most meats. These fish should be a staple of everyone's heart-healthy diet.

How Does Fish Help?

Omega-3 fatty acids have been shown to lower triglycerides, which are a type of fat in the bloodstream. Experts aren't sure of the exact mechanism. Omega-3 fatty acids may also slow down the growth of plaques in the arteries and reduce inflammation throughout the body.

What's the Evidence?

A number of studies going back years have shown the benefits of fatty fish. In an important review of studies, researchers found that getting daily omega-3 fatty acids from fish oil could lower triglyceride levels by 25%-30%. The results were published in The American Journal of Clinical Nutrition in 1997.

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