Synopsis

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

Vitamin B complex, particularly vitamins B2 (riboflavin), B3 (niacin), B6 (pyridoxine), B9 (folic acid), and B12 (cobalamin), has some scientific support for roles in vascular health, which includes the capillaries. These B vitamins are involved in homocysteine metabolism; elevated homocysteine is a known risk factor for vascular dysfunction and disease, including damage to small blood vessels (capillaries). Supplementation with folic acid, B6, and B12 has been shown in various studies to lower homocysteine levels, which may help protect capillary integrity.

Additionally, niacin (B3) is well established for its vasodilatory effects and can improve microcirculation, which includes capillary blood flow. However, direct evidence that B vitamins alone specifically support or repair capillaries in otherwise healthy individuals is limited. Most research focuses on their role in overall cardiovascular health and in the prevention of vascular complications in people with elevated cardiovascular risks (e.g., diabetes, hyperhomocysteinemia).

In summary, while there is mechanistic and some clinical evidence suggesting vitamin B complex (especially B6, B9, and B12) can help maintain vascular health and thus indirectly support capillary function, the evidence is moderate and not directly targeted at capillaries alone. The use of vitamin B for capillary support is therefore scientifically plausible but not robustly proven for this specific application.

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