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Here's some more info on Niacin:
Functions: in energy metabolism, especially fat
Deficiency:
Pellagra (means rough or painful skin)
Three Ds: Dementia, dermatitis, diarrhea
Death can occur
Early symptoms include poor appetite, weight loss, and weakness
Food sources:
Poultry, beef, tuna/fish, wheat bran, asparagus, peanuts
Also coffee and tea
Can synthesize niacin from Tryptophan
Requirements
RDA: 14 to 16 milligrams per day, DV is 20 mg
Toxicity:
UL is 35 milligrams of the nicotinic acid form
Headache, itching, and increased blood flow to the skin (flushing)
GI tract and liver damage possible
Sometimes large amounts are used under a doctor's supervision to treat cardiovascular disease
Just a little info from my nutrition class last semester. If you start taking large doses of niacin (100mg+) out of no where that is when you start seeing obvious signs of toxicity like red skin and itchiness.
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