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B-complex vitamins may cause temporarily flushing or an upset stomach, and the vitamin is used to supplement a poor diet and prevent or treat vitamin deficiency, states WebMD. Vitamin deficiency can be caused by pregnancy, certain illnesses and alcoholism.


Vitamin B-100 complex addresses vitamin deficiency that may be due to causes including alcoholism, specific medical conditions, pregnancy or an inadequate diet, WebMD states. Vitamin B-100 complex consists of a combination of B vitamins, considered the モbuilding blocksヤ of the body, making it benefi


Vitamin B complex consists of eight vitamins that help in energy production, amino acid metabolism and cell division, according to eVitamins. Vitamin B complex is used in the treatment of a wide variety of conditions: It aids in healing wounds, canker sores, acne, alcohol withdrawals, heartburn and


Common side effects of vitamin B-3, also known as niacin, include flushing, dizziness, upset stomach, intestinal gas and mouth pain, according to WebMD. The flushing reaction can cause redness, tingling and itching of the face, chest and arms, along with a headache. Drinking alcohol can worsen the f


Common side effects of vitamin B-6 supplementation include nausea, drowsiness, headache, and tingling or mild numbness, according to eMedicineHealth. More serious side effects include tiredness, clumsiness in the hands, numbness in the feet or around the mouth, loss of coordination or balance, and d


Side effects of vitamin B-12 include stomach pain, nosebleeds, chest pain, dizziness and irregular heartbeat, according to Drugs.com. Additional side effects include ringing in the ears, chest tightness, difficulty breathing, weakness and weight gain.


The side effects of taking too much vitamin B-2, or riboflavin, are photosensitivity, itching skin, burning, prickling or numbness, and orange or deep yellow urine, according to the University of Maryland Medical Center. People who take more than 10 milligrams of vitamin B-2 a day may suffer eye dam


Less serious side effects of vitamin B-1 include a tight feeling in the throat, nausea, sweating and feeling warm, according to Drugs.com. Other possible side effects include itching, a mild rash and a feeling of restlessness. If vitamin B-1 is administered intravenously, there may be a hard lump or


The benefits of vitamin B-12 include its support of the central nervous system, the skin, hair, liver and eyes, according to the University of Maryland Medical Center. However, high levels of vitamin B-12 can imbalance the other B vitamins, which should work in concert. Vitamin B-12 also can cause n


Taking vitamin B-12 counters the negative effects of vitamin B-12 deficiency, according to Mayo Clinic. Studies show that the mental function of infants is affected by vitamin B-12 levels during pregnancy. Vitamin B-12 use may cause harmful effects for individuals with certain health conditions.