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Vitamin and Mineral Toxicities in Adults
hair folicle tests

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Vitamin B1
(thiamine)
1.5/1.1 mg 1.5 mg 300 mg Gastric upset and prolonged large parenteral injections can lead to sensitized anaphylactoid reactions.
Vitamin B2
(riboflavin)
1.7/1.3 mg 1.7 mg 1000 mg None reported in humans; precipitates in kidneys and hearts of laboratory rats.
Niacin
(nicotinic acid and nicotinamide)
19/15 mg NE 20 mg or 20 mg NE 1 g Nicotinic acid - vascular dilation, gastrointestinal irritation, increased muscle glycogen utilization, decreased serum lipids, decreased mobilization of fatty acids from adipose tissues, and hepatomegaly.
Nicotinamide - nausea, heartburn, fatigue, dry hair, sore throat, and inability to focus eyes.
Vitamin B6 2.0/1.6 mg 2.0 mg 200 mg Dizziness, nausea, ataxia, perpheral neuropathy, and systemic conditioning to high intakes.
Folic Acid
(folate and folacin)
200/180 mcg 400 mcg 5 mg Can obscure the diagnosis of pernicious anemia by preventing anemia and permitting nerve damage and may reduce zinc absorption; precipitates in kidneys of laboratory rats.
Vitamin B12 2.0/2.0 mcg 6.0 mcg Unknown None reported; rat studies indicate that folate metabolism may be affected.
Biotin 30-100 mcgd 0.3 mcg Unknown None reported; controversial as to whether reproductive performance of female rats is affected.
Pantothenic Acid 4-7 mgd 10 mg 10 g Occasional diarrhea and edema.
Choline Vitamin-Like Substancee 20 g Nausea, dizziness, diarrhea, depression, excessive cholinergic stimulation, and EKG abnormalities; salivating, trembling, cyanosis, convulsions, and respiratory paralysis reported in laboratory rats.
Carnitine Vitamin-Like Substancee Unknown Occasional diarrhea.
Inositol
(myo-inositol)
Vitamin-Like Substancee Unknown None reported except problems may arise when inositol breakdown is impaired (diabetes mellitus, chronic renal failure, galactosemia, and multiple sclerosis).
Taurine Vitamin-Like Substancee Unknown None reported.
Bioflavonoids Vitamin-Like Substancee Unknown Some bioflavonoids have been associated with increased occurrence of several cancers.
Calcium 800/800 mg 1 g Over 2.5 g Nausea, constipation, hypertension, hypercalcemia, kidney stones, myopathy, and may inhibit absorption of iron and zinc; individuals with conditions that cause hypercalcemia or nephrolithiasis should not take calcium supplements.

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