howtosupplement
Heart/Inflammation

L-Arginine

A nitric oxide precursor amino acid that may modestly improve blood flow, blood pressure, and vascular function in adults.

L-Arginine

L-Arginine

59
score
B
evidence
Caution
risk
Quick Take

Reasonable for mild blood-flow goals, but effects are modest and it is not a must-have for most adults.

L-arginine is a semi-essential amino acid found in meat, poultry, dairy, soy, legumes, nuts, and seeds. It is used to make nitric oxide, a signaling molecule that relaxes blood vessels and supports circulation. Best-backed benefits are modest blood-pressure reduction, improved endothelial function, and some benefit for mild erectile dysfunction. It is most relevant for adults with specific vascular goals rather than people seeking a broad wellness supplement.

Proven Benefits

01
Lowers blood pressure modestly
02
Improves endothelial function
03
Improves erectile function
04
May improve arterial stiffness
05
May lower CRP/TNF-α
06
May improve walking tolerance

Protocol

Amount
3-6 g
Frequency
Daily, split into 2-3 doses
When
Between meals for absorption, or with food if it causes stomach upset.

Onset Time

Some vascular effects within days; clearer changes usually take 2-8 weeks

Who Should Consider

Adults with mildly elevated blood pressure
People with endothelial dysfunction or circulation concerns
Men with mild erectile dysfunction after medical review
Adults exploring nitric-oxide support for vascular health

Food Sources

  • Pumpkin seeds (~2 g per 30 g)
  • Turkey breast (~1.6 g per 100 g)
  • Pork loin (~1.5 g per 100 g)
  • Soybeans or edamame (~1.3 g per cooked cup)
  • Peanuts (~1 g per 30 g)
  • Chickpeas or lentils (~0.8-1.2 g per cooked cup)

How It Works

L-arginine is converted by nitric oxide synthase into nitric oxide. Nitric oxide relaxes vascular smooth muscle, widens blood vessels, and improves endothelial signaling, which can support blood flow, blood pressure, and blood-flow-dependent function such as erection.

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