5 Nutrients Involved in Male Sexual Function
Male sexual function is not controlled by one hormone or one biological process.
Normal sexual response depends on several systems working together — including blood flow, nitric oxide signaling, hormone production, nerve communication, and reproductive function.
Nutrition is involved in each of those systems.
Certain nutrients have specific biological roles that researchers continue to study in relation to male sexual health.
Here are 5 nutrients involved in male sexual function and what each one actually does.
1. L-Arginine
L-arginine is an amino acid your body uses as a direct building block for nitric oxide.
An enzyme called nitric oxide synthase converts L-arginine into nitric oxide inside blood vessels.
Nitric oxide then signals the smooth muscle surrounding blood vessels to relax, allowing blood flow to increase.
That process is particularly important during a normal erectile response.
A systematic review and meta-analysis examined 10 randomized controlled trials involving 540 men with mild-to-moderate erectile dysfunction. Researchers found improvements in erectile-function measurements among men receiving L-arginine compared with placebo or no treatment. [1]
L-arginine's connection to male sexual function is largely vascular: it supplies the material the body uses to produce nitric oxide needed for normal erectile blood flow.
2. Vitamin D
Vitamin D is commonly associated with bone health, but vitamin D receptors are also found in the cells lining blood vessels.
Those cells make up the endothelium.
Vitamin D is involved in regulating eNOS, the endothelial enzyme responsible for producing nitric oxide.
Nitric oxide helps blood vessels relax and respond when increased blood flow is needed, making this system an important part of normal erectile function.
A 2025 systematic review examined 10 studies involving more than 13,000 men and found that men with moderate-to-severe or blood-flow-related erectile dysfunction frequently had lower vitamin D levels than men with milder symptoms. [2]
A separate scientific review reported that vitamin D can influence eNOS activity and nitric oxide availability within endothelial cells. [3]
That gives vitamin D a clear connection to male sexual function through:
endothelial function → nitric oxide → vascular response → erectile blood flow.
3. Zinc
Zinc is an essential mineral involved in hundreds of biological processes throughout the body.
For men, one important role involves androgen function, including testosterone.
Testosterone plays an important role in male sexual desire, arousal, and normal sexual function.
Researchers have studied the relationship between zinc status and testosterone for decades.
A systematic review evaluated 38 studies, including eight human clinical studies, and found a positive relationship between zinc status and testosterone. The size of the relationship varied according to factors such as starting zinc status, testosterone levels, dose, and duration. [4]
Zinc is therefore involved in the hormonal side of male sexual function, helping support the biological systems involved in normal androgen and testosterone physiology.
4. Folate
Folate, or vitamin B9, has an important connection to vascular function and nitric oxide availability.
One of its active forms, 5-methyltetrahydrofolate, is involved in processes that help the eNOS enzyme function normally.
This matters because eNOS is responsible for producing nitric oxide inside the endothelium.
A scientific review found that folate can support nitric oxide availability by helping maintain normal eNOS function and reducing oxidative reactions that can interfere with nitric oxide. [5]
Researchers have also examined folate specifically in relation to erectile function.
A meta-analysis of six studies involving 1,842 participants found that folate levels were higher among men without erectile dysfunction than among men with it. Differences also became larger across increasing levels of ED severity. [6]
Folate's connection to male sexual function therefore comes largely through endothelial health, nitric oxide availability, and the vascular response required for normal erectile function.
5. Selenium
Selenium is an essential trace mineral incorporated into proteins called selenoproteins.
Several of these proteins are active throughout the male reproductive system and help regulate oxidative balance.
Selenium is involved in sperm development, maturation, structure, and movement, all of which contribute to normal male reproductive function.
A 2025 scientific review found that selenium homeostasis is closely connected with spermatogenesis, sperm maturation, and motility. [7]
One important selenium-containing protein is glutathione peroxidase 4, or GPX4.
GPX4 helps protect reproductive cells from oxidative damage and also contributes to the structure and function of mature sperm.
Selenium's role is therefore different from nutrients such as L-arginine or folate.
Its connection is primarily through normal reproductive function and protection of reproductive cells from oxidative stress.
The Bottom Line
Male sexual function involves several biological systems working together.
L-arginine provides the material needed for nitric oxide production and erectile blood flow.
Vitamin D is involved in endothelial signaling and nitric oxide regulation.
Zinc supports normal testosterone and androgen physiology.
Folate contributes to endothelial nitric oxide availability.
And selenium supports normal male reproductive function.
Each nutrient works through a different part of the system.
Together, they show how blood flow, nitric oxide, hormones, vascular signaling, and reproductive biology all contribute to normal male sexual function.
