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In the blood stream as nicotinic acid, it can cause skin flush and this reaction is actually responsible for the tolerable upper limit (UL) for niacin at 35 mg/d for adults in US (20)
Daily topical applications at 0.05-0.1 % in liposomal vehicle have been validated in several controlled trichology dermatology studies
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Vitamin C (L-Ascorbic acid, 200mg) : Cht chng oxy ha quan trng gip tng cng h min dch
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