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  2. Is Taking Too Much Vitamin B-12 Dangerous? - ConsumerLab.com

    www.consumerlab.com/answers/can-too-much-b-12-be-dangerous/too-much-b12

    Doses of just 20 mcg per day or higher have caused outbreaks of acne and rosacea. 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. In ...

  3. Vitamins & Supplements That Interfere With Blood Tests & Medical...

    www.consumerlab.com/answers/vitamins-and-supplements-that-should-be-stopped...

    The supplements that can cause these interactions include B vitamins such as biotin, niacin and riboflavin, as well as calcium supplements, creatine, iron supplements, St. John’s wort, vitamin C, L-tryptophan, and 5-HTP, as well as certain foods and drinks. High-dose N-acetyl cysteine (NAC) may also interfere with certain tests, although this ...

  4. Vitamin B Supplement Reviews & Top Picks - ConsumerLab.com

    www.consumerlab.com/reviews/review-best-b-vitamins-and-complexes-energy-b6-b12...

    Also see our Top Picks for B-12 and other B vitamin supplements. Read our reviews of B vitamin supplements to find the best B complex, niacin, B-6, B-12, biotin, thiamin and folate, including "methyl" forms such as methylfolate. Get information about dosage, safety, and B vitamins for energy, memory, depression and more.

  5. Which Is Better? Sublingual B-12 vs. Vitamin B-12 Pills ...

    www.consumerlab.com/answers/is-sublingual-vitamin-b-12-really-better-than-the...

    Updated February 26, 2019 ⓘ. Answer: Although sublingual B-12 — a form placed under the tongue and allowed to dissolve — is often promoted for better absorption, there does not appear to be much evidence for this. In fact, one clinical study comparing the same amount of B-12 given orally or under the tongue found they were equally ...

  6. Can B vitamins build up to toxic levels in the body? -...

    www.consumerlab.com/answers/can-b-vitamins-build-up-to-toxic-levels-in-the...

    B-3 (Niacin) Skin flushing/pain; liver toxicity; elevated blood sugar. B-6. Nerve damage, skin lesions. B-9 (Folate/Folic Acid) Kidney damage; masking of B-12 deficiency. B-12. Acne/rosacea a side effect in some people. More information about the beneficial and toxic effects of these vitamins, including associated dosage, is found in the B ...

  7. Safety and uses of desiccated beef liver - ConsumerLab.com

    www.consumerlab.com/answers/desiccated-beef-liver/beef-liver

    Desiccated beef liver supplements that are described as being "defatted" provide significant amounts of vitamin B-12 and protein without the fat normally found liver. Some also provide a moderate amount of iron. For instance, Desiccated Liver by Solgar provides 2 grams of protein, 100 mcg (4167% Daily Value [DV]) of vitamin B-12, and 2 mg (11% ...

  8. Vitamin B-12: What Is The Best Way To Take - ConsumerLab.com

    www.consumerlab.com/answers/whats-the-best-way-to-take-vitamin-b12/best-way-to...

    To absorb more B-12, divide the dose over the course of the day and take separately from a B-12-containing meal. If you take a higher dose, such as 100 mcg, you will absorb only about 1% of the amount above 2.4 mcg — although this may be appropriate in some situations. For details, see the Vitamin B-12 section of the B Vitamin Supplements Review.

  9. Vitamin B-6 Overdose Avoidance & Info - ConsumerLab.com

    www.consumerlab.com/answers/can-too-much-b-6-be-dangerous/too-much-b6

    The negative effects of too much vitamin B-6. High doses of vitamin B-6 can cause nerve damage and skin lesions, muscle twitching, increased risk of hip fracture, and other adverse effects. One clinical study found that 25 mg of B-6 taken daily as part of a B-complex vitamin increased the risk of heart attack, stroke and death in diabetes ...

  10. Which vitamins and minerals should someone over 70 take?

    www.consumerlab.com/answers/vitamin-mineral-requirements-over-seventy/over-seventy

    Answer: The vitamin and mineral requirements of people over 70 years old are similar to those of younger adults with a few exceptions: There is an increased daily need for vitamin D (rising to 800 IU from 600 IU, or 20 mcg from 15 mcg) and for calcium (rising to 1,200 mg from 1,000 mg, although, for women, this increase begins at age 51.)

  11. Too Much Vitamin B6. Be aware that you can get too much vitamin B6 from supplements and energy drinks. This can result in nerve damage and other adverse effects, as has been recently reported. For details, see the B6 section of the B Vitamin Supplements Review.