What supplements are used to support healthy circulation?
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
The most-used are beetroot or dietary nitrate, L-citrulline, and pine bark or grape seed extract. Beetroot and citrulline have the most consistent human data, both acting through nitric oxide. L-arginine is widely sold but poorly absorbed, which is why citrulline replaced it.
Key takeaways
- L-citrulline raises blood arginine more effectively than L-arginine does.
- Beetroot and citrulline both work through nitric oxide, by different routes.
- Anyone on nitrates for angina should avoid all of these without medical advice.
The nitric oxide group
Nitric oxide relaxes the smooth muscle in blood vessel walls. Beetroot supplies nitrate that oral bacteria and the body convert to NO. L-citrulline takes a different route: it converts to arginine in the kidneys, which the enzyme nitric oxide synthase then uses to make NO. Citrulline is the better choice over arginine because oral arginine is largely broken down in the gut and liver before it reaches circulation — which is why 6–8 g of citrulline raises blood arginine more than the same dose of arginine itself.
Polyphenol extracts
Pine bark extract and grape seed extract have some evidence for endothelial function and, in pine bark's case, for chronic venous insufficiency — the heavy, swollen legs some people get. Horse chestnut seed extract has reasonably good evidence for venous insufficiency specifically, better than most supplements in this area. These act mainly through antioxidant and vascular tone effects rather than nitric oxide.
The caution that matters most
All nitric-oxide-boosting supplements can add to the effect of nitrate medication used for angina, and to PDE5 inhibitors such as sildenafil. That combination can cause a dangerous drop in blood pressure. If you take nitrates, this whole category is off-limits without a doctor's involvement.
Key ingredients to understand
The ingredients most relevant to this question, with what the evidence actually supports:
- Beetroot (Dietary Nitrate) — Beetroot is a dietary source of nitrate that the body turns into nitric oxide, relaxing blood vessels. It has reasonably good evidence for…
- L-Citrulline — L-citrulline is an amino acid that the body converts into arginine — and it raises nitric oxide more effectively than taking arginine directly.…
- Grape Seed Extract — Grape seed extract is rich in antioxidant proanthocyanidins. Its best-supported effect is a modest reduction in blood pressure in some people;…
Frequently asked questions
Is L-arginine worth taking?
Rarely. Poor oral bioavailability means citrulline achieves more at a comparable dose.
How much citrulline?
Trials use 6–8 g of L-citrulline, or roughly 8 g of citrulline malate. Doses below 3 g are unlikely to do much.
When is poor circulation a medical problem?
Leg pain on walking that stops at rest, coldness or colour change in a limb, non-healing wounds, or sudden numbness all need medical assessment rather than a supplement.
Related on FactoWiki
- Heart & Cardiovascular Health supplements — the full category
- All health answers
- Ingredient evidence guides
- Beetroot (Dietary Nitrate) — ingredient guide
- L-Citrulline — ingredient guide
- How we review
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