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Most people suffer no side effects when taking up to 10 mg daily of biotin, but some experience an allergic reaction, including hives or an upset stomach, according to Drugs.com. If the reaction includes swelling of the face or oral cavity, hives or difficulty in breathing, emergency medical care is


Use of biotin in high doses has been shown to cause hives, difficulty breathing and swelling of the face, lips, tongue and throat. These effects are uncommon in normal doses, claims Drugs.com.


Biotin high-potency vitamin supplements are available on iHerb.com, SuperSup.com and ProfessionalSupplementCenter.com. Biotin is commonly referred to as vitamin B-7 and is water-soluble; therefore, it must be replenished on a daily basis, according to Dr. Weil.


As of 2015, biotin isn't known to cause major side effects in doses up to 10 milligrams per day, indicates Drugs.com. Minor side effects may include upset stomach or mild skin rash. Individuals experiencing signs of an allergic reaction, such as hives or difficulty breathing, should see a doctor imm


Biotin tablets are not known to cause side effects when amounts of up to 10 milligrams per day are ingested, according to Mayo Clinic. Biotin is a B-complex vitamin that functions as a component of enzymes which breaks down carbohydrates, fats and other substances, explains WebMD.


Biotin is not only safe, it is vital to overall health and in treating certain medical ailments, according to WebMD. Biotin supports a person's nerves, skin, digestive tract and cells. It also contributes to a healthy metabolism. Some research suggests that, in combination with other nutrients, biot


Biotin is a water-soluble B-vitamin that has no known side effects when taken in doses up to 10 milligrams. WebMD reports that the vitamin is regarded as safe, but it has no established recommended daily allowance, and few studies exist that analyze the effects of high doses on the body. Regardless,


The most common side effects of vitamin D include fatigue, weakness, dry mouth or a metallic taste in the mouth, loss of appetite, nausea and vomiting, according to WebMD. Most people do not experience side effects with vitamin D, unless they take too much.


Possible side effects of excessive vitamin E include diarrhea, nausea, stomach cramps and blurred vision. Other potential side effects include headache, dizziness and unusual tiredness or weakness, according to Drugs.com.


Side effects of too much vitamin D include weakness, sleepiness, headache, fatigue and loss of appetite, according to MedlinePlus. Other side effects may include a metallic taste, vomiting, nausea and dry mouth.