Erectile Dysfunction: What the Evidence Actually Supports

Erectile dysfunction is one of the most searched health topics by men, and also one of the most heavily marketed to. Between supplement ads promising a "natural fix" and clinics selling expensive add-on treatments, it can be hard to tell what is backed by research and what is backed by a marketing budget. Here is what the evidence actually says, and what a reasonable evaluation looks like.

Erectile dysfunction is common, and it is rarely just "in your head"

Difficulty getting or keeping an erection becomes more common with age. The Massachusetts Male Aging Study, one of the largest population surveys on this topic, found that some degree of erectile dysfunction affected about half of men between 40 and 70, with complete dysfunction rising from roughly 5% to 15% across that age range (Feldman et al., 1994).

For decades, ED was often chalked up to stress or psychological factors alone. That can play a role, particularly with situational or performance-related anxiety. But most cases in men over 40 involve a physical component: reduced blood flow, nerve signaling changes, hormone shifts, or a combination of the three (Yafi et al., 2016). Diabetes, high blood pressure, high cholesterol, smoking, obesity, and low testosterone are all associated with higher rates of ED. Some medications, especially certain blood pressure drugs and antidepressants, contribute as well.

This matters because "it's probably just stress" is not a diagnosis, and it can delay finding a treatable cause.

The supplement industry counts on you not asking questions

Sexual enhancement supplements are a large and largely unregulated market, and that gap gets exploited. A JAMA Network Open analysis of a decade of FDA warnings found 776 adulterated supplements pulled from the market between 2007 and 2016, and sexual enhancement products were the single largest category, at 45.5% of all warnings. Nearly half of those contained sildenafil, the active ingredient in Viagra, without disclosing it on the label (Tucker et al., 2018). The FDA maintains an ongoing public list of tainted sexual enhancement products for this reason (FDA).

That means a supplement marketed as "all natural" may actually contain an undeclared prescription drug, at an unknown and unregulated dose. That is a real safety issue if you take nitrates for heart disease, since combining nitrates with a PDE5 inhibitor like sildenafil can cause a dangerous drop in blood pressure. It is also just poor value: you are paying supplement prices for what may be a hidden, uncontrolled dose of a medication you could get labeled correctly and monitored by a clinician.

Not every non-prescription approach is worthless. Some research on Panax ginseng has shown modest benefit in small trials, though the overall evidence is far weaker and less consistent than the evidence for prescription options, and quality control across ginseng products varies widely (Moyad & Park, 2012). The honest summary: some supplements have thin, mixed evidence behind them, and none have anywhere near the track record of the medications your prescriber can offer.

What the evidence actually supports

A few approaches have real data behind them:

• PDE5 inhibitors (sildenafil, tadalafil, vardenafil) work by increasing blood flow to the penis and are the first-line treatment for most men, with decades of trial data behind them. They require sexual stimulation to work and are not a spontaneous trigger for erections.
• Treating the underlying driver matters as much as the medication itself. If low testosterone, poorly controlled blood sugar, or untreated high blood pressure is part of the picture, addressing that condition often improves erectile function on its own, and may improve how well a PDE5 inhibitor works.
• Weight loss and exercise have measurable effects. Studies of significant weight loss, including through bariatric surgery, have shown improvement in erectile function scores alongside improvements in testosterone levels (Reis et al., 2010). You do not need surgery to benefit; the direction of effect holds for lifestyle-driven weight loss too, though it tends to take months rather than weeks.
• Newer diabetes and weight-loss medications are an active area of research. Early evidence suggests GLP-1 receptor agonists may improve erectile function and testosterone levels in men with obesity, independent of weight loss alone, though the number of men studied so far is still small (Corona et al., 2026).

None of this requires a dramatic lifestyle overhaul or an expensive proprietary protocol. It requires an accurate diagnosis and a treatment plan matched to your actual cause.

When ED is a signal about your heart, not just your sex life

The blood vessels supplying the penis are narrower than the coronary arteries feeding your heart, so vascular narrowing sometimes shows up as ED before it shows up as chest pain. This is why new-onset erectile dysfunction in a man without an obvious cause, such as a new medication, is worth a basic cardiovascular check: blood pressure, cholesterol panel, and fasting glucose or A1C. This is not meant to alarm you. Most men with ED do not have a hidden heart condition. But finding out is quick, and the same lab work that clarifies your ED often clarifies your broader health picture at the same time.

What a real evaluation looks like

A useful ED evaluation usually starts with questions, not a prescription pad reflex. When did it start, is it situational or constant, what medications are you on, how is your sleep, and are there other symptoms like low energy or reduced muscle mass that might point toward low testosterone. From there, basic labs, such as total testosterone, fasting glucose, and a lipid panel, help confirm or rule out common contributors. Treatment is then matched to what is actually driving things, rather than defaulting to the same medication for everyone.

Next steps

If erectile dysfunction has been on your mind, it is worth a real conversation instead of another supplement. Stonewood Health offers telehealth evaluation and treatment for erectile dysfunction as part of our men's health services, with prescriptions and lab orders handled the same way they would be anywhere else in primary care. Learn more at /conditions/mens-health. Most major plans are accepted, including Medicare, so getting this evaluated does not have to be an out-of-pocket decision.