The Optimization Era
Sep 29, 2026Supplements, peptides, and our never-ending search for an edge
10-minute read
Behind the Counter
In my early twenties, I spent about four years working behind the counter at GNC, and I loved it. A customer would come back a few weeks after I'd recommended something and tell me it had actually helped, and every time that happened, I wanted to learn more. It was the first time I understood that knowing your stuff could genuinely change someone's life.
It didn't take long to understand how much responsibility came with that. People with heart disease, metabolic problems, chronic health conditions, and long lists of prescriptions would stand across the counter from a twenty-something retail employee and ask what they should take. And I was working inside a retail business. There were products the company wanted sold, products my managers wanted pushed, and products that paid a better commission. Sales reps were always coming through with the next breakthrough, and the products that moved fastest were usually the ones promising the fastest results. Sometimes what the store wanted me to sell was exactly what the person in front of me needed. Sometimes it wasn't. That tension pushed me to start educating myself, and it's a big part of how I ended up doing what I do today.
What the store needed from a sale and what the customer needed for their health weren't always the same thing. Looking back, GNC also gave me a front-row seat to something I've now watched for more than twenty years. There is always a next big thing.
We've Always Wanted an Edge
The promise behind every next big thing has barely changed in decades: lose fat faster, build muscle faster, recover faster, have more energy, look younger, live longer.
Ephedra is my favorite example, because it complicates the easy story. In the late nineties, this stimulant, taken from a plant long used in traditional Chinese medicine and usually paired with caffeine, powered a generation of fat burners. A government-commissioned review found it really did produce modest short-term weight loss. It also came with real risks, especially combined with other stimulants, and after reports of serious side effects and several high-profile deaths, the FDA banned it in 2004. Something can work and still come with tradeoffs that take years and millions of users to understand.
After ephedra came prohormones, then steroid-like research chemicals sold online, then a steady stream of newer fat burners and muscle builders. The cycle is almost always the same. Something gets discovered and people get excited. The claims outrun the evidence, money floods in, and huge numbers of people try it before anyone has studied it properly. Eventually the evidence catches up and the benefits and risks come into focus, and by then something newer has arrived. The products keep changing. The promise is remarkably familiar.
But sometimes the breakthrough really is extraordinary, and one of the best examples came from a lizard.
The Gila Monster in the Room
After you eat, your gut releases a hormone called GLP-1. Think of it as a message to the rest of your body that food has arrived. It helps your pancreas release insulin to manage blood sugar, and it helps tell your brain you've had enough. The catch is that natural GLP-1 disappears from your bloodstream within minutes. Researchers knew this signal could help people with diabetes, but a message that fades that fast is hard to turn into medicine.
Part of the answer came from the desert. The Gila monster lives in the American Southwest and northern Mexico and is one of the only venomous lizards in North America. It can go months without eating, living off fat stored in its tail, and then has to handle a huge meal all at once. In the early nineties, an endocrinologist named John Eng, working at a VA hospital in the Bronx, found a hormone in its venom that acted like human GLP-1 but lasted far longer. That discovery became exenatide, the first drug of its kind approved in the United States. The newer drugs people talk about today, like semaglutide and tirzepatide, were built differently, but the Gila monster helped prove that targeting this signal could work. The drugs now reshaping medicine and coming up at every dinner party owe a debt to lizard spit. Evolution solved a problem in a desert reptile that we'd been working on for decades, and most people taking these drugs have no idea the story exists.
That's a big part of why peptides fascinate me. Peptides are short chains of amino acids, and many of them work as signals, the way GLP-1 does. We're learning to speak the body's own language and influence systems it already uses. I've used peptides myself and had really positive experiences with them. I'm not looking at this world from the outside, thinking optimization is foolish. I'm excited by it. But our ability to push on a biological pathway can move faster than our ability to understand what pushing on it for years will do.
For every Gila monster, there are dozens of breakthroughs that don't hold up, and while you're living through one, it's surprisingly difficult to tell which is which.
When the Gym Gets It Right, and When It Doesn't
I've recommended creatine for more than twenty years, and for much of that time, clients told me their doctors had warned them it would damage their kidneys. Meanwhile, research supporting creatine use in healthy people had been building since the early nineties. Today it's one of the most studied supplements available, discussed for strength, aging, and even brain health, where the research is promising but still early.
It would be easy to turn that into gym bros knowing more than doctors, but the gym wasn't ahead of science. It was the world's largest, least official creatine trial. The more interesting question is why the gap lasted so long, and part of the answer is a lab test. Doctors estimate kidney function by measuring creatinine, a waste product in the blood, and taking creatine naturally raises it. A perfectly healthy person on creatine can have bloodwork that looks like their kidneys are struggling. The doctors weren't being careless; they were trusting the tools they were trained to trust. Add an influential case report about a man who already had kidney disease, and you get a fear that outlived the evidence by years.
Bodybuilders have always been unusually willing to experiment on themselves. Sometimes they're onto something early. Sometimes they're spectacularly wrong. And sometimes they prove something works while also proving that "works" and "is healthy" are different questions. Steroids build muscle; nobody needs a study to believe that. But when researchers followed more than 20,000 competitive bodybuilders, those who died had done so at an average age of about 45.
Anecdote isn't proof, but it isn't worthless either. One person's experience proves very little. Patterns across thousands of people can be a signal worth investigating. But no amount of personal experience can reliably tell you what caused what, what happens after ten years, what rare risks exist, or what's changing inside your body that you can't see in the mirror. And even when something does work, there's a more basic question most of us never ask: is that actually what's in the bottle?
Do You Know What You're Actually Buying?
A while back, I looked into launching a Protean supplement line, and I was surprised by how commercially straightforward it could be. Manufacturers will produce ready-made formulas with your logo on the label. There are real manufacturing and labeling rules, so this isn't someone mixing powders in a garage, but supplements don't need FDA approval before they're sold. If I'd launched Protean Supplements, many of my clients would probably have trusted it because they trust me. Would they know who formulated it, who manufactured it, where the ingredients came from, or what testing was done? Brand trust isn't the same thing as product verification.
This month a reader told me she'd been buying from a company partly because it advertised third-party testing. When she asked to see the results, the company wouldn't share them or explain what it tested for. She canceled her subscriptions and started shopping elsewhere, and I think she was right to. Real independent testing means an outside lab checked that what's in the bottle matches the label and isn't contaminated. A seal from an independent organization like NSF or USP is one sign of that. For brands without one, ask for the lab report on the batch you're buying. A company that takes testing seriously will send it.
The question gets more consequential when the product isn't something you swallow but something you inject. A peptide can reach you in very different ways. An approved medication has been through clinical trials, and its manufacturing is inspected. A compounded prescription is made by a licensed pharmacy for a specific patient, with oversight but not the same level of testing. And a vial bought online and labeled "for research use only" comes with whatever quality control the seller decides to provide. That last category is booming. U.S. imports of peptide and hormone compounds from China roughly doubled in the first nine months of 2025 compared with the year before.
Foreign manufacturing isn't inherently the problem. China and India produce enormous amounts of legitimate medicine that Americans take every day. When the FDA reviewed overseas suppliers of GLP-1 ingredients, about one in five failed its standards, while facilities in China and India were among those that passed. The issue is traceability. Who made it? Under what standards? Who tested it? What happened between the factory and the vial in your hand? Most of us know more about where our coffee beans were grown than about what's in a vial we're injecting.
The Optimization Era
Twenty years ago, optimization meant a cabinet full of supplements. Today it means peptides, GLP-1 medications, hormone clinics, glucose monitors, and wearables that grade your sleep every morning. Health has become something we optimize, and I genuinely love part of that. People casually talk about muscle mass, metabolic health, recovery, VO2 max, and healthspan now. I've been nerding out about this stuff for more than twenty years, and I'm glad everyone else finally wants to talk about it.
Some of these tools are the real deal. In a large trial of people with obesity and existing heart disease, semaglutide reduced the combined risk of heart attack, stroke, and cardiovascular death by about 20 percent. But science doesn't stop when a drug gets approved. Trials are rigorous, but they can't fully replicate millions of people taking a medication for years, and researchers are still learning things about these drugs that only widespread use could reveal.
A client told me recently that a friend had complimented her on how she looked. The friend knew she'd been working with a coach and asked how long it had taken. When my client said about eighteen months, the friend sighed, clearly disappointed it had taken that long. I understand the sigh. We've all absorbed the idea that results should come fast.
Speed isn't automatically bad, but it usually comes with tradeoffs. The harder we push one outcome, the more important it becomes to ask what else is changing. Lose weight very quickly and more of what you lose can come from muscle. Build muscle faster than a body can naturally manage and something else is paying for it. The scale, the mirror, a glucose reading, and a sleep score each measure one thing. Optimizing one metric isn't the same as optimizing your health, and getting healthy was never about looking good for one moment. It's about making every year a healthy year, not just one fit summer.
But after twenty years of watching the tools change, what stands out most to me is what hasn't.
Build the House
Through every miracle product and breakthrough, the things that actually build health have barely changed, and the simplest way I know to explain them is a house. Training and nutrition are the foundation and the frame. Training gives your body a reason to stay strong and capable, and enough protein, energy, and real food give it the materials to do it. Daily movement, sleep, and recovery are the upkeep that keeps the structure sound, because adaptation happens in recovery, not in the workout. Managing stress is how the house handles weather. You can't stop storms from coming, but you can build something that stands up to them. And purpose and people are what turn a building into a home. Relationships, community, and something you care about belong in any honest conversation about health.
The tools fit into that house in different ways. Creatine is a better building material. A supplement that corrects a deficiency patches a gap in the wall. A medication like a GLP-1 can work like scaffolding, letting someone reach parts of the house that felt out of reach before. Whether it stays up for months or for years, what matters most is what gets built while it's there. And once the structure is solid, there's nothing wrong with making it better. That's where optimization becomes the final coat of paint. Paint matters, and it's what makes a good house feel finished. But it doesn't hold up the roof, and no amount of it will fix a cracked foundation.
None of this means you should be afraid of the tools. The goal isn't to reject supplements, peptides, medications, or technology. It's to make better decisions about them. Before adding something, slow down and ask a few questions. What am I actually trying to accomplish? What evidence is there that this helps? What do I know about the product and who made it? What are the known risks, and what don't we know yet? And most importantly, am I using this to support something I'm already building, or am I asking it to build it for me?
Sometimes the answer is yes. Take the creatine. Correct the deficiency. Talk to your doctor about the medication. Use the technology. If your foundation is strong and you've decided the potential benefit is worth the uncertainty, experiment around the edges. The point was never to avoid optimization. It's to put it in its proper place.
More than twenty years after standing behind that GNC counter, I'm still fascinated by the same question: what can we do to help the human body work better? The tools are better now, the science is better, and our ability to understand and influence human biology is extraordinary. I'm genuinely excited to see what comes next. Some new ideas will be transformative. Some will disappoint us. Some things the fitness world is experimenting with today will become mainstream, and some will turn out to have consequences we haven't seen yet. Curiosity doesn't require blind trust, and skepticism doesn't require cynicism.
After watching breakthroughs come and go for two decades, the things I trust most are still the least exciting. Train. Eat well. Move. Sleep. Recover. Learn to manage stress. Find something you care about. Surround yourself with people who make your life better. Then use the tools that make sense for you, ask better questions, and don't mistake the newest tool for health itself.
Build the house. Then worry about the paint.
Written by Coach Andy Gallagher, owner and head coach of Protean Fitness. I've spent nearly 20 years in the health and fitness industry helping busy people build healthy habits that last. Have a question or interested in coaching? Reach out at [Andy@proteanfitness-dc.com]
- Ephedra's weight loss and ban. Link "A government-commissioned review" to:
https://www.everycrsreport.com/reports/RL30750.html - The Gila monster story. Link "an endocrinologist named John Eng" to:
https://365.military.com/benefits/veterans-health-care/lizard-venom-ozempic-how-va-research-changed-medicine.html - Creatine safety. Link "one of the most studied supplements available" to:
https://www.supplysidesj.com/healthy-living/analysis-finds-no-support-for-concerns-about-creatine-side-effects - The creatinine lab issue and the history of the kidney fear. Link "part of the answer is a lab test" to:
https://nutraingredients.com/Article/2026/04/29/from-loading-to-long-term-what-the-science-says-about-creatine-safety - Bodybuilder mortality. Link "more than 20,000 competitive bodybuilders" to:
https://pmc.ncbi.nlm.nih.gov/articles/PMC12342505/ - Peptide imports from China. Link "roughly doubled in 2025" to:
https://reason.com/2026/07/27/the-peptide-gray-market-is-already-here-the-fda-is-just-catching-up/ - FDA's review of overseas suppliers. Link "about one in five failed its standards" to:
https://navigator.global/us/library/fda-launches-green-list-to-block-dangerous-glp-1-imports - The semaglutide heart trial. Link "by about 20 percent" to:
https://pharmacytimes.com/view/select-trial-semaglutide-improves-glycemic-control-for-patients-at-high-risk-of-cardiovascular-disease
