You may have heard of people taking vitamin B-12 supplements of shots. Do you need to take supplements, and are the shots truly of value?
Vitamin B-12 is necessary for the development of red blood cells, proper neurological functions, and the prevention of anemia. Vitamin B-12 is also needed for the production of DNA.

Some weight loss clinics tout vitamin B-12 shots as weight loss tools, but there is no evidence this works. If you think your might be B-12 deficient, ask your doctor for a test; most people have stored enough B-12 to last them for years. Taking extra vitamin B-12 will not improve your metabolism or give you extra energy unless you are anemic –which again, can be proven by a simple blood test. Always get advice from a trusted doctor before you start taking vitamin B-12 shots or self-medicate with mega-doses of B-12, especially asking about the interactions of B-12 and medications.
Most people get plenty of vitamin B-12 if they regularly eat animal products. You don't need to worry at all if you eat meat, eggs, fortified products, dairy products, or shellfish. Vegans—people who do not eat any animals products at all—are
particularly susceptible to vitamin B-12 deficiency. However, if vegans eat fortified cereals, they probably aren't at high risk of deficiency.
If you get between 2.6-2.8 micrograms of vitamin B-12 a day, you're probably getting enough. Just one cup of milk plus a suggested serving of fortified cereal can meet your vitamin B-12 needs for the day. If you have a deficiency, you probably have a problem absorbing B-12 or using the B-12 that your body has already stored. The problem may be that your intestines are functioning properly and allowing your body to take in the B-12, or it could be that your body has stored the B-12, but can't release it for use. Most Americans are not B-12 deficient because they eat a diet rich in animcal products, and their bodies naturally store the B-12 for years.
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