Evidence supporting the use of: Vitamin B3
For the body system: Capillaries

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Vitamin B3, also known as niacin, has some scientific validation for its effects on the vascular system, including the capillaries. Niacin is well-documented to cause peripheral vasodilation, which can increase blood flow through capillaries and other small blood vessels. This is most notably observed in the "niacin flush," a temporary reddening of the skin due to capillary dilation. Additionally, niacin has been used clinically to manage dyslipidemia by improving cholesterol profiles, which can indirectly support vascular health. However, while these effects are relevant to the vascular system as a whole, direct evidence specifically regarding capillary structure or function is limited. Most clinical studies focus on niacin’s impact on large blood vessels or overall cardiovascular risk rather than the capillaries in isolation.

Historically, deficiencies in niacin (pellagra) have been associated with poor skin health and vascular issues, which further supports its general role in maintaining vascular integrity. Nevertheless, supplementation of vitamin B3 specifically to "support capillaries" beyond correcting deficiency lacks robust direct evidence. The rating of 3 reflects moderate evidence: niacin does influence blood flow through capillaries, but its routine use for targeted capillary support is not strongly established in scientific literature.

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