Answer: If your B-complex contains 50,000% of the Daily Value (DV), which is 6 mcg for adults, then it has 3,000 mcg of B-12. For people without a severe B-12 deficiency, this is certainly more than necessary. Taking some B-12 is advisable for people over the age of 50 (when you're less able to extract B-12 from food), as well as for those taking medications that interfere with B-12 absorption, strict vegetarians, alcohol and drug abusers, people recovering from surgery or burns, and those with bowel or pancreatic cancer. Although vitamin B-12 is generally considered to be safe, and no "Upper Tolerable Intake Level" has been established, there are some reports of doses of 20 mcg per day or higher causing outbreaks of acne and rosacea. There is also a study which showed that a high-dose B complex supplement (with 1,000 mcg of B-12) hurt, rather than helped, people with type 1 or type 2 diabetes and advanced kidney disease, resulting in a worsening of kidney function and an increase in the risk of heart attack, stroke and death.
Be aware that sublingual and dissolvable B-12 supplements often contain sugar substitutes which can, in some people, cause gas, bloating, and diarrhea -- particularly if taking multiple pills. In women who are pregnant, excessive blood levels of vitamin B-12 have been associated with an increased risk of autism in their children. In general, it's best to avoid excessive doses of any vitamin if it is not needed. 's tests of popular products, in the B Vitamin Supplements Review >> You can check the recommended intakes of other vitamins and minerals here. Also see the CL Answer "Can taking too much vitamin B-6 be dangerous?" See other recent and popular questions >>We read all questions and try to answer those of popular interest.Vitamin B12 is an essential, water-soluble vitamin your body uses to generate proteins and keep your blood healthy. Adults should consume between 2.4 and 2.9 micrograms of vitamin B12 on a daily basis by eating foods that are rich in this nutrient, such as beef liver, rainbow trout or clams, the Office of Dietary Supplements reports.
If you have vitamin B12 deficiency anemia due to low blood levels of this vitamin, your doctor may recommend daily treatment with 1,000 mcg of a vitamin B-12 supplement. The side effects of taking this daily supplement are limited, but should be discussed with your doctor before beginning treatment. You may experience diarrhea as a side effect following treatment with a daily 1,000-mcg dose of vitamin B12. Diarrhea is a condition characterized by frequent bowel movement urges that produce loose or watery stools. If you develop diarrhea, you may also experience excess gas or abdominal pain or cramping. Persistent diarrhea may increase the amount of fluid your body loses each day and may cause dehydration. Consult your physician if diarrhea side effects persist or become severe while you are taking vitamin B12 supplements. A skin reaction may occur after you take a dose of vitamin B12. You may notice the appearance of red, irritated patches of skin across your body. If possible, avoid scratching irritated skin, as doing so may increase your risk of developing a skin infection.
Daily 1,000-mcg doses of vitamin B12 may be recommended by your doctor if you have low blood levels of the vitamin. Symptoms of vitamin B12 deficiency anemia, also called pernicious anemia, include bowel movement changes, diminished appetite, breathing difficulties, poor concentration, numbness or tingling, fatigue, pale skin, oral swelling or bleeding gums. Talk with your doctor if you exhibit any of these symptoms to ensure you receive appropriate treatment and care. Gain 2 pounds per week Gain 1.5 pounds per week Gain 1 pound per week Gain 0.5 pound per week Maintain my current weight Lose 0.5 pound per week Lose 1 pound per week Lose 1.5 pounds per week Lose 2 pounds per week Vegetarian Foods Rich in Vitamin B12 Niacin & the Side Effects on Blood Pressure Side Effects of Niacin or B-3 Can the Human Body Digest Red Meat? Stomach Pain After Eating Red Meat The Side Effects of Too Much Vitamin B12 Definition of B12 Vitamin 1000 MCG
Side Effects of Niacin & Hives Is 500 mg of B12 Too Much to Take? Are There Advantages of Sublingual Vitamin B12? How to Decrease Flushing Side Effects of Niacin Besides Aspirin Eating Meat Makes My Stomach Hurt List of Foods High in Vitamin B12 Does Vitamin B-12 Cause Diarrhea? What Are the Benefits of B12 Pills? Negative Side Effects of Taking Vitamin D Supplements Side Effects of Vitamin D Injections Chromium Nicotinate Side Effects Vitamin B12 1000 mcg Timed Release Tablet Vitamin B12 1000 mcg Timed Release Vitamin B12 is important for the metabolic pathways that release cellular energy from fat and protein.† Important for proper red blood cell formation† Necessary for normal function of the nervous system† Along with other B vitamins, vitamin B12 is important for converting the food you eat into cellular energy.† Vitamin B12 is also important for proper red blood cell formation and normal function of the nervous system.† Vitamin B12 supplements may be important for vegetarians and vegans who avoid dietary sources rich in vitamin B12.†
Helps convert food into cellular energy† Essential for proper red blood cell formation† Helps support nervous system function† Nature Made Vitamin B12 1000 mcg Timed Release Tablet is guaranteed to meet our high quality standards – it is made from carefully selected ingredients under strict manufacturing processes. No Yeast or Starch Available Sizes: 75 Count / 160 Count Interactions:Vitamin B12 should be avoided when taking: Current research does not indicate that this vitamin should be avoided when taking prescription drugs Vitamin B12 should be used with caution when combined with: Current research does not indicate that this vitamin should be used with caution when taking prescription drugs Given that no two people are alike, if you are taking any medications you should be aware that potential drug-nutrient interactions may occur and are encouraged to consult a health care professional before using this product. What are some dietary sources of vitamin B12?