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For 12 years, four of the biggest adult film studios in the Valley have paid me off the books to clear their male performers before signing them to seven-figure contracts. I've examined 320 of them. About 11 percent age in a way the other 89 percent do not — and almost none of them know which group they're in. My name is Dr. Adam Klein. I am 52 years old. I graduated from Northwestern Feinberg School of Medicine in 1999 and completed my cardiology fellowship at UCLA in 2008. For the first six years of my career I ran a standard cardiology practice in West LA, reading stress tests and cardiac catheterizations and writing prescriptions for the parade of statins, beta blockers, and ACE inhibitors that every cardiologist over 45 writes more of every year. In 2013, one of the major adult film production companies in the Valley contacted me with a problem. They had lost two performers in the previous three years to mid-shoot cardiac events. Their insurance carriers were demanding pre-signing cardiac clearance for every performer over 35 they brought under contract. They needed a cardiologist who could perform the workups confidentially, with no record traceable to the production company. I took the contract. Three studios followed within eighteen months. By 2015 I was the cardiac gatekeeper for all four rosters. Those examinations included coronary CT calcium scans, stress tests, echocardiograms, and full vascular function workups on performers ranging in age from 26 to 64. I have followed individual performers for over a decade across multi-year contracts. I have watched some of them maintain coronary calcium scores of zero into their late 50s. I have watched others come in at 38 with calcium scores already at 180 — biological cardiovascular ages of men twenty years older. I am writing this because what I have learned about cardiac aging in this population applies to every man over 40 in this country. And the cardiac profession has been treating the early warning signs wrong for as long as I have been licensed. Let me explain what I mean by "11%." Adult film performance is, in cardiovascular terms, an extreme test. A male performer has to sustain elevated heart rate, controlled vasodilation, and reliable on-demand cardiac output for periods of 90 minutes to several hours under high stress and bright lights — sometimes multiple times in a single shooting day. Most cardiologists wouldn't clear a 50-year-old patient with elevated cardiac risk for that kind of exertion. Adult performers do it for a living. This means their cardiovascular systems are exposed to demand the average man's cardiovascular system rarely sees. And it means I get to watch cardiac aging in fast-forward. A 35-year-old performer who is failing his second cardiac clearance has, biologically, the coronary calcium burden of a 50-year-old desk worker who hasn't done a stress test in a decade. A 52-year-old performer who is passing his clearance with calcium score zero has, biologically, the coronary profile of a healthy 35-year-old. The same chronological age. Completely different cardiovascular age underneath. For 12 years I have been documenting which performers maintain low coronary calcium scores and which accumulate plaque. I have ordered the bloodwork. I have done the imaging. I have followed the same individuals across years. And the pattern I have identified is consistent enough that I can predict, within six months of accuracy, when a performer is going to start declining. Here is what I have learned that contradicts what most cardiologists are still telling their patients. ED is the first warning, not the symptom. The 89% of performers who eventually accumulate coronary plaque almost always show early ED symptoms 5-8 years before their cardiac calcium score crosses 100. The 11% who maintain low calcium scores almost never report ED symptoms even into their 60s. The pattern is so consistent that when a performer comes to me for cardiac clearance and mentions casual ED symptoms, I order an extended cardiac workup before clearing him for the next contract cycle — even if his standard panel is unremarkable. ED is not a sexual problem. It is a vascular problem expressed sexually first because the penile arteries are the smallest in the male body. By the time the larger coronary arteries show plaque, the penile arteries have been signaling damage for years. The 11% of performers who age well never lose nitric oxide signaling in the small vessels, so they never develop the ED that precedes coronary plaque accumulation. The standard cardiology treatments don't address what's actually happening. Statins lower LDL cholesterol. Beta blockers control heart rate. ACE inhibitors lower blood pressure. None of these compounds restore endothelial function — the underlying mechanism that determines whether your coronary arteries accumulate plaque or stay clear. I have watched performers on statins for five years continue to accumulate coronary calcium. I have watched performers off all cardiac medications maintain calcium scores of zero. The difference is not whether they're medicated. The difference is whether their endothelium is functioning. The 11% have one thing in common. I started studying this small group years ago. I compared their bloodwork to the 89% who were declining. I imaged their vasculature. I interviewed them about lifestyle, diet, supplementation, training. The performers who maintained low coronary calcium scores into their 50s were all activating one specific receptor inside their endothelial cells. The endothelial cells, for context, are the thin lining inside every blood vessel in your body. They are the cells that produce nitric oxide — the molecule that won the 1998 Nobel Prize in Medicine for being the master signal that tells your arteries to relax, your blood to flow, and your cardiovascular system to function the way it was designed to function. The receptor is called TRPV1. In 2021, Dr. David Julius at UC San Francisco won the Nobel Prize in Medicine for discovering this receptor. TRPV1 sits inside the endothelial cells of your blood vessels. When it is activated, it triggers continuous nitric oxide production and a cellular repair cycle — the endothelial cells clear oxidative damage, restore their energy reserves, and prepare to produce nitric oxide again at full capacity. When TRPV1 is active, the endothelium repairs itself faster than it accumulates damage. Coronary calcium does not accumulate. The vessels stay clear. When TRPV1 is inactive, the endothelium accumulates damage faster than it repairs. Calcium starts depositing inside vessel walls. By the time a standard cardiology workup catches it, the damage is years deep. This is the single mechanism separating the 11% of performers with calcium scores of zero from the 89% with progressive calcium accumulation. The 11% had active TRPV1. Their endothelial cells were rebuilding themselves on a cellular schedule that most men's cells abandon by 35. Once I understood this, I started looking for the same pattern in my regular cardiology practice. It was everywhere. Every man over 45 with rising coronary calcium had the same problem as the failing performers. Inactive TRPV1. Damaged endothelium. Collapsed nitric oxide production. Plaque accumulating year after year while their cardiologists adjusted their statin doses and assumed they were "managing" the disease. The statins were not addressing the mechanism. They were lowering one input — circulating LDL — while the endothelium continued to deteriorate. I started telling my patients about TRPV1. I started telling them about the Nobel Prize research. And I started telling them about the compound that activates TRPV1. The compound is capsaicin. The active ingredient in cayenne pepper. This is the part where most patients laughed at first, the same way I laughed when one of my performer patients told me about it in 2014. Hot peppers? That is the cardiologist's recommendation? But the science is not a joke. Capsaicin is the only natural compound that directly activates TRPV1 in the human endothelium. When capsaicin reaches the endothelial cells at therapeutic doses, it binds to TRPV1, the receptor switches on, and the cells begin producing nitric oxide and running their repair cycle. A 2017 study in Atherosclerosis showed sustained capsaicin exposure reversed early atherosclerotic changes and improved endothelial function in 67% of subjects over 90 days. A 2024 study in Aging and Disease confirmed the cellular mechanism. Subsequent work has shown the same mechanism applies across the coronary, peripheral, and renal microvasculature. The 11% of performers were already doing this — most of them without knowing the mechanism. They knew capsaicin worked. They didn't know why. I figured out the why by looking at their imaging across 12 years. The catch — and this fooled me for the first two years I started recommending capsaicin to patients in my private practice — is delivery. Capsaicin is fat-soluble. In dry powder capsules from a supplement aisle, your stomach and liver destroy approximately 85% of the active compound before it ever reaches the bloodstream. Patients were swallowing capsaicin. Almost none of it was reaching their endothelial cells. The bloodwork didn't move. The calcium scores kept climbing. Effective protocols use oil-suspended capsaicin combined with piperine, which increases absorption by 2000%. The performers in my study — the 11% who maintained low calcium scores — were all, independently, getting their capsaicin in oil-suspended form. Most were buying from compounding pharmacies. A few were dissolving pharmaceutical-grade capsaicin in MCT oil at home. About 14 months ago, I found a product that finally formulated this correctly. Aurivita Capsaicin Power. 3mg pharmaceutical-grade capsaicin per serving, pre-dissolved in cold-pressed avocado oil, with BioPerine for absorption enhancement, plus the supporting compounds — beetroot, K2, hawthorn, cinnamon, turmeric, ginseng, berberine — that work alongside TRPV1 activation in the endothelial repair cycle. I take it myself. My most recent vascular ultrasound and coronary calcium scan showed arterial elasticity better than at age 48. I am 52. I recommend it to my cardiac patients who present with rising coronary calcium scores, ED symptoms, or both. The bloodwork moves. The calcium scores stabilize and in many cases decline. The ED symptoms resolve. Most importantly, the underlying mechanism — endothelial function — is being addressed rather than masked. Here is what I want you to take from this letter. If you are a man over 40 and you have noticed that your cardiac risk factors are creeping up — that your last lipid panel was worse than the one before it, that your calcium score has crossed 50 or 100, that your blood pressure requires medication where it used to not, that your ED has crept in alongside all of this — you are watching the same pattern I watch in the 89% of performers who don't make it to long-term contracts. It is not aging. It is endothelial dysfunction. The receptor that keeps your vessels repairing themselves has gone quiet, and your standard cardiology workup is going to address every downstream symptom — cholesterol, blood pressure, blood sugar — without ever addressing the upstream mechanism. The 11% of performers I have followed for over a decade are doing one thing differently. They are activating TRPV1. You can do the same thing. If you want to try Aurivita Capsaicin Power, you can order it from the official website at aurivita.co/products/cayenne-pepper-softgels. One bag is 60 days at $54. The company offers a 120-day money-back guarantee. Take it for four full months. Track your coronary calcium score, your lipid panel, your blood pressure, and your erectile function. If you do not see meaningful improvement — the same kind I have watched in 11% of performers and in many of my own patients — send the bag back, full or empty, and you get a full refund. I have been writing cardiology prescriptions for two decades. I have never seen a pharmaceutical compound come with a 120-day money-back guarantee. That tells you something. The link is below. aurivita.co/products/cayenne-pepper-softgels — Dr. Adam Klein, MD, FACC Board-Certified Cardiologist, 26 years in practice Adult industry cardiac consultant, 12 years P.S. If your calcium score has crossed 100, or if you have already had a cardiac event, you are not too late. The 89% of performers I watch decline are not "irreversible" cases — they are cases that no one ever intervened on with the right mechanism. TRPV1 activation can stabilize and in many cases reverse early-stage coronary calcium accumulation. The window is open right now. In five years it may not be.