Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Vitamin B3 (niacin) is scientifically validated for use in supporting circulation, particularly in the context of cardiovascular health. Niacin is well-known for its vasodilatory effects—it can cause blood vessels to widen, leading to a characteristic "niacin flush" that increases blood flow to the skin and peripheral tissues. Clinical studies have shown that niacin supplementation can improve lipid profiles by raising HDL ("good") cholesterol and lowering LDL ("bad") cholesterol and triglycerides, which contributes to improved vascular health and may assist with peripheral circulation.

Additionally, niacin has been investigated for its role in treating peripheral arterial disease (PAD) and other circulatory problems, with some studies indicating that it may improve walking distance and reduce symptoms of claudication (pain caused by too little blood flow during exercise). However, the routine use of niacin for general poor circulation is less well-established, and high-dose niacin can have significant side effects, such as liver toxicity and glucose intolerance. Despite these risks, the underlying mechanism—vasodilation and lipid modification—is well supported in the scientific literature, and the use of niacin in improving aspects of circulation is recognized in cardiology guidelines, particularly for dyslipidemia-related circulatory issues.

In summary, niacin's use for supporting circulation is backed by substantial scientific evidence, especially for patients with underlying lipid disorders or atherosclerosis, but its use should be guided by a healthcare professional due to potential side effects.

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