Vascular & erectile function
One of 4 mechanistic pathways to ❤️🔥 Libido & sexual function · 10 options
An erection is a haemodynamic event. Nitric oxide relaxes smooth muscle, blood fills, veins compress. Erectile dysfunction is also an early warning of systemic endothelial disease — the penile arteries are narrower than the coronaries and clog first, which makes this a cardiovascular symptom worth taking seriously.
Erectile dysfunction is an early cardiovascular symptom — the penile arteries are narrower than the coronaries and narrow first, typically three to five years ahead. Treat this as a heart finding, because it is one.
Lipid Panel (Cholesterol, HDL, LDL, Triglycerides)ApoB (Apolipoprotein B)HbA1c (Hemoglobin A1c)ADMA & SDMAhs-CRP (High-Sensitivity C-Reactive Protein)🫀 Real Cardiovascular Risk covers these in one panel →
What engages this pathway
Ordered by how directly each one acts on the mechanism above — never by how much trial evidence exists. Each links to its full breakdown with dosing, half-life and vendor.
💉 Tadalafil
PDE5 inhibition with a 17.5-hour half-life, so daily low-dose use decouples the drug from the event. Also approved for BPH, and there is interesting evidence for endothelial and cardiovascular benefit from chronic low-dose use.
💉 Sildenafil
The original PDE5 inhibitor. Shorter acting, more on-demand in character. Requires arousal to work at all — it amplifies the signal, it does not create it.
🧬 L-Arginine
NOS substrate. Combined with pycnogenol it has positive trial data for erectile function; alone it underperforms because of first-pass metabolism.
🧬 Citrulline Malate
Raises arginine more effectively than arginine does. A small trial showed improved erection hardness scores.
🧬 Pycnogenol
Increases eNOS expression; the arginine-pycnogenol combination has the best trial evidence of any supplement pairing here.
🧬 Beetroot (Nitrates)
Dietary nitrate provides NO through a completely separate, NOS-independent pathway — which is why it can work when the enzymatic route is impaired.
🧬 Nitrosigine
Better-absorbed arginine with sustained blood-flow data.
🧬 Cocoa Flavanols
Endothelial function improvement with strong trial support.
🧬 Panax Ginseng
Meta-analysis supports improved erectile function; ginsenosides appear to act through nitric oxide.
💉 Nebivolol
If blood-pressure medication is the cause — and beta-blockers frequently are — this is the one in the class that improves erectile function rather than degrading it, because of its NO-mediated vasodilation.
The other 3 routes to libido & sexual function
Pick the pathway that matches where you are actually stuck. An appetite drug does nothing for someone who already undereats.
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Frequently asked questions
An erection is a haemodynamic event. Nitric oxide relaxes smooth muscle, blood fills, veins compress. Erectile dysfunction is also an early warning of systemic endothelial disease — the penile arteries are narrower than the coronaries and clog first, which makes this a cardiovascular symptom worth taking seriously.
10 options are mapped to this pathway in the Vault, including Tadalafil, Sildenafil, L-Arginine, Citrulline Malate. They are grouped by the mechanism they act through rather than ranked by how much trial evidence exists — 10 carry clinical validation and 0 are mechanistic predictions.
Erectile dysfunction is an early cardiovascular symptom — the penile arteries are narrower than the coronaries and narrow first, typically three to five years ahead. Treat this as a heart finding, because it is one. The markers worth checking are Lipid Panel (Cholesterol, HDL, LDL, Triglycerides), ApoB (Apolipoprotein B), HbA1c (Hemoglobin A1c), ADMA & SDMA.
Unproven is not the same as ineffective. Of the 10 options on this pathway, 10 have clinical validation and 0 are graded theoretical — meaning the mechanism is sound but the specific human trial has not been run, which is true of a great deal of what works in this space. Nothing on this page is ordered by evidence tier, because sorting by trial count would bury the compounds you came looking for.