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Who should not take B complex vitamins?

High blood sugar. High doses of nicotinic acid, a synthetic form of vitamin B3, can raise blood sugar levels. This can interfere with diabetes medications. People with diabetes or high blood sugar should not take high doses of nicotinic acid (measuring 1,000 mg or more).

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Vitamin B refers to not one, but eight different vitamins. All B vitamins play a role in converting food into energy in the body. Each vitamin also has a unique role in a person’s health. Vitamin B-complex supplements include all of the essential B vitamins in one pill. Some contain 100% of the recommended daily allowance (RDA) of every B vitamin. Others contain higher doses of some or all of these vitamins. Many people get all the vitamin B they need from a varied, balanced diet. However, others may benefit from taking a vitamin B-complex supplement. A note about sex and gender Sex and gender exist on spectrums. This article will use the terms “male,” “female,” or both to refer to sex assigned at birth. Click here to learn more. Daily recommendations for vitamin B-complex supplement Many B-complex supplements contain about 100% of the RDA of each of the eight B vitamins. However, some contain very high levels of certain B vitamins. Before taking a high-dose supplement, talk with a doctor. The following are RDAs for each of the B vitamins, in milligrams (mg) or micrograms (mcg), according to The National Institutes of Health Office of Dietary Supplements . Older adults may require higher dosages of some B vitamins. Males Females During pregnancy During breastfeeding Vitamin B1 1.2 mg 1.1 mg 1.4 mg 1.4 mg Vitamin B2 1.3 mg 1.1 mg 1.4 mg 1.6 mg Vitamin B3 or dietary equivalents 16 mg 14 mg 18 mg 17 mg Vitamin B5 5 mg 5 mg 6 mg 7 mg Vitamin B6 (adults 19-50) 1.3 mg* 1.3 mg* 1.9 mg 2.0 mg Vitamin B7 30 mcg 30 mcg 30 mcg 35 mcg Vitamin B9 or dietary equivalents 400 mcg 400 mcg 600 mcg 500 mcg Vitamin B12 2.4 mcg 2.4 mcg 2.6 mcg 2.8 mcg *The National Institutes of Health advises that male adults over 51 require 1.7 mg and female adults over 51 require 1.5 mg. Side effects and risks of vitamin B-complex supplement B vitamins are water-soluble. This means that, most of the time, the body excretes extra B vitamins in the urine. While a standard dosage does not seem to cause harm, excessively high doses of certain B vitamins can be dangerous. Speak with a clinician before taking very high doses of B-complex supplements. Possible side effects of B-complex vitamins: High blood sugar. High doses of nicotinic acid, a synthetic form of vitamin B3, can raise blood sugar levels. This can interfere with diabetes medications. People with diabetes or high blood sugar should not take high doses of nicotinic acid (measuring 1,000 mg or more). High doses of nicotinic acid, a synthetic form of vitamin B3, can raise blood sugar levels. This can interfere with diabetes medications. People with diabetes or high blood sugar should not take high doses of nicotinic acid (measuring 1,000 mg or more). Excess nicotinic acid. Too much nicotinic acid can also cause low blood pressure, fatigue, headaches, rashes, and liver damage.

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Too much nicotinic acid can also cause low blood pressure, fatigue, headaches, rashes, and liver damage. Excess nicotinamide. High doses of nicotinamide, another form of vitamin B3, can cause diarrhea and increased bleeding. This can occur in doses of 500 mg per day. Doses higher than 3,000 mg can cause vomiting and liver damage. High doses of nicotinamide, another form of vitamin B3, can cause diarrhea and increased bleeding. This can occur in doses of 500 mg per day. Doses higher than 3,000 mg can cause vomiting and liver damage. Excess folic acid. Taking more than 1,000 mcg of folic acid a day can mask a type of anemia caused by vitamin B12 deficiency. Taking a high-dose B-complex supplement can also turn the urine bright yellow. This effect is temporary and harmless. Once the kidneys get rid of the extra vitamins, the color will return to normal. Choosing the right vitamin B-complex supplement A doctor may recommend a certain type of this supplement, depending on a person’s health needs. Some vitamin and supplement companies use independent quality testing of their products. Those that pass may have a seal of approval from an independent testing organization. This seal does not guarantee that the product is 100% safe or effective for everyone. However, it means that the product contains what is listed on the label without contaminants. Some testing organizations and their certifications include: ConsumerLab.com’s approved quality product seal

NSF International’s dietary supplement certification

the verified mark of the United States Pharmacopeial Convention (USP)

Interactions for vitamin B-complex supplement In most cases, vitamin B does not interact negatively with other medications. However, certain medications can make a vitamin B deficiency more likely. These are some examples of medications that can result in low levels of specific B vitamins: Blood pressure drugs and chemotherapy drugs can lower a person’s B1 levels.

Antiseizure medications used for epilepsy can lower B3, B6, and B9 levels.

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Drugs that treat tuberculosis can cause low levels of B3 and B6.

Certain cancer drugs can lower B9 levels.

Certain drugs that treat ulcerative colitis can cause low levels of vitamin B9. Certain antibiotics and medications for ulcers, diabetes, or gastroesophageal reflux disease (GERD), may lower B12 levels. When to speak with a doctor Anyone who is at higher risk of having a vitamin B deficiency should talk with a medical professional. People with certain health conditions including HIV, alcohol use disorder, and Crohn’s disease may not absorb vitamin B effectively. Older individuals and people with a vegetarian or vegan diet may also be at higher risk. Symptoms of a vitamin B deficiency will vary depending on what B vitamin a person is lacking. A person with a vitamin B12 deficiency may experience: tingling in the hands or feet

fatigue

pale or jaundice skin

shortness of breath

fast heartbeat

mouth ulcers, burning, or pain

cognitive impairment

digestive issues including diarrhea, vomiting, and nausea, which may lead to weight loss irritability or depression A doctor may conduct a blood test to confirm a vitamin B deficiency.

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