Testosterone and Your Cells: What Men Can Do Before Considering TRT

You've noticed it gradually. Recovery after a hard workout takes an extra day. Your energy and drive aren't quite where they were at 30. Then the ads start showing up in your feed for testosterone clinics, boosters, and before-and-after photos.

Most men never get a clear picture of how testosterone works, so it's hard to know what to make of any of it.

Here's what often gets lost: your cells make testosterone, and that process depends on healthy cell membranes. Once you see how production works, the steps you can take on your own make a lot more sense.

In this blog, we'll walk through how your body makes testosterone, why membranes matter, what shifts with age, and the everyday habits that may support healthy production, including where phosphatidylcholine (PC) fits in.

Table of Contents:

• Why Isn't Hormone Health a Bigger Conversation for Men?
• How Does Your Body Make Testosterone?
• Where Do Cell Membranes Come In?
• Why Does Testosterone Shift as You Age?
• What Can You Do to Support Healthy Testosterone Production?
• Where Does PC Fit In?
• When Should You Talk With Your Practitioner?
• From the Ground Up: Your Hormone Health Starts in the Cell

Why Isn't Hormone Health a Bigger Conversation for Men?

Hormone health often gets framed as a women's topic. Perimenopause and menopause get articles, podcasts, and entire product lines. Men's hormones mostly show up in two places: gym culture and "low T" marketing.

Neither tells you much about what's happening inside your body.

Testosterone does far more than build muscle. It helps maintain strength and bone density, supports sex drive, and plays a role in energy and mood. Levels also shift gradually across a lifetime, much like women's hormones do.

The goal is healthy function. That means supporting the systems that keep testosterone production running smoothly, rather than chasing the highest possible number.

How Does Your Body Make Testosterone?

Most of a man's testosterone is made in the testes, inside specialized cells called Leydig cells. Production follows a chain of steps, starting in your brain. The hypothalamus signals the pituitary gland, which releases luteinizing hormone (LH) into your bloodstream.

When LH reaches the testes, it attaches to receptors on the surface of Leydig cells and signals them to start producing. The cells respond by gathering cholesterol, the raw material all steroid hormones are built from. (That’s right, you need cholesterol for healthy hormones!) That cholesterol then moves into the mitochondria, the cell's energy makers, where the first conversion step happens. From there, additional enzymes finish the job and turn that first product into testosterone.

This doesn't mean more cholesterol raises testosterone. Your body makes and regulates its own cholesterol supply, so the real bottleneck is getting cholesterol to the right place inside the cell.

Where Do Cell Membranes Come In?

Here's the part most explanations skip: nearly every step in that chain happens on or across a membrane. Membranes are the thin, flexible layers that wrap every cell and every structure inside it. They're built largely from phospholipids, and phosphatidylcholine is one of the most abundant.

The process starts at the Leydig cell's outer membrane, where the LH receptor sits, so the signal to make testosterone arrives there first. From there, cholesterol heads into the mitochondria, which have two membranes of their own. It must travel from the outer membrane to the inner membrane, and that transfer is the slowest, most tightly controlled step in the process. A protein called StAR handles the transfer, and research shows StAR turns on when it contacts phospholipids in the outer mitochondrial membrane.

Once cholesterol crosses over, the enzyme that makes the first conversion is waiting on the inner mitochondrial membrane. The finishing enzymes work largely in the endoplasmic reticulum, another membrane-bound structure inside the cell.

Testosterone production leans on healthy membranes at several points along the way. Our guide to cellular health explains why membranes are so central to how your body works.

Why Does Testosterone Shift as You Age?

Testosterone declines gradually as men get older. Studies that followed the same men for years found a slow, steady drop, and men in better overall health tended to have higher levels than their peers.

At the cell level, researchers have found that aging Leydig cells respond less strongly to the LH signal than younger ones. One leading explanation is oxidative stress, a buildup of wear and tear inside the cell that can interfere with moving cholesterol into the mitochondria. Much of this work comes from animal and lab studies, but it points back to the same place: the health of the cell and its membranes.

Age is only one piece. Sleep, body weight, and diet all affect how well this system runs, and those are areas where you have real input.

What Can You Do to Support Healthy Testosterone Production?

These habits work on the conditions testosterone production depends on. None of them are a quick fix, and they work best together.

Protect your sleep

A large share of your daily testosterone release depends on sleep. In one study, healthy young men who slept five hours a night for a single week had noticeably lower daytime testosterone. If you're regularly short on sleep, or you wake up tired no matter how long you've been in bed, treat sleep as a priority instead of the first thing to get cut.

Support a healthy weight

Carrying extra body weight is linked with lower testosterone. A pooled analysis of weight-loss studies found that testosterone rose as men lost weight, with bigger changes in men who lost more. A gradual, sustainable approach to weight loss is one of the most meaningful steps you can take.

Don't fear dietary fat

Your cells need fat to build membranes and hormones. When researchers compared lower-fat and higher-fat diets in men, testosterone ran lower on the low-fat versions. Build meals around whole-food fats like eggs, fish, olive oil, nuts, and seeds. Eggs also supply choline, which your body uses to make phosphatidylcholine. Our guide to omega-3 and omega-6 fats explains how to think about healthy fat balance.

Keep moving

Strength training and regular movement help you build and keep muscle and support a healthy body composition. That makes them a foundation for the rest of this list, even though a single workout won't reset your hormone levels.

Where Does PC Fit In?

Since testosterone production depends on membranes at so many points, it makes sense to think about what those membranes are made of.

Phosphatidylcholine is one of the main phospholipids in your cell membranes, including mitochondrial membranes. Your body makes some of it and gets some from food, but it's constantly used and replaced as cells repair and renew themselves. PC decreases as you age too. For the full picture, our guide to phosphatidylcholine walks through how it works throughout the body.

BodyBio PC is a phospholipid complex with phosphatidylcholine as its main component, formulated to help support the cell and mitochondrial membranes that testosterone production relies on.*

PC works alongside sleep, food, and movement, not in place of them. Think of it as support for the cellular foundation those habits are already working on.

When Should You Talk With Your Practitioner?

Regular checkups are part of taking care of your hormones, and for some men, that conversation may lead to testosterone replacement therapy (TRT). You and your practitioner make that decision together, since TRT involves ongoing monitoring and can affect your body's own production and fertility. Starting with sleep, food, movement, and cellular support gives you a stronger foundation whichever path you take.

From the Ground Up: Your Hormone Health Starts in the Cell

Testosterone can feel like just a number on a lab report, but it begins as a process inside your cells. A signal arrives at a membrane, cholesterol crosses a membrane, and enzymes do their work on a membrane, all before testosterone ever reaches your bloodstream.

That's why the most useful steps are often the simplest: consistent sleep, a healthy weight, enough good fats, regular movement, and nourishing your membranes with phospholipids like PC.* Give these habits time. Cells renew gradually, and the support you give them pays off over months, not days.

Men deserve the same thoughtful hormone conversation women have been building for years, and it starts with caring for the cells that make it all possible.

Support the membranes where testosterone production begins with BodyBio PC.*