Dear readers,
There is a moment in every physician’s career — if they are paying attention — when the framework they were trained in simply stops being enough. For me, it crept in over years of watching patients do everything right and still feel wrong. Eating well. Exercising. Sleeping. And yet: the fatigue that never lifted, the weight that wouldn’t budge, the fog that dulled what should have been a sharp and vibrant life.
I was asking the wrong question. Instead of asking what is broken, I needed to ask: what is the cell itself actually doing? That question rewired my entire practice.
The answer lives inside structures so ancient they predate complex life itself. It lives in the mitochondria.
Mitochondria are not simply a power plant. They are the master regulators of how your body ages, how your hormones signal, how your metabolism responds under stress, and whether your cells repair or surrender into disease. When I began seeing patients through this lens, everything changed.
Lifestyle Is the Foundation
Before any molecule or intervention, there are the choices that either starve or nourish your mitochondria every single day. Mitochondria multiply in response to demanding, varied movement — strength training and Zone 2 cardio together are among the most potent mitochondrial medicines in existence. Sleep is when mitochondrial repair happens. Time-restricted eating triggers mitophagy, the cellular housekeeping cycle that clears out dysfunctional mitochondria to make room for new ones.
Lifestyle is not the alternative to medicine. It is the terrain on which every medicine operates. The interventions below are powerful precisely because they work synergistically with the body you are actively building through how you live.
NAD+: The Master Switch of Cellular Vitality
NAD+ is the coenzyme that powers ATP production and activates the sirtuins — proteins that regulate aging, DNA repair, and metabolic efficiency. The problem is that NAD+ levels decline roughly 50% between ages 40 and 60. This single fact helps explain why the forties so often feel like a turning point. Something is genuinely shifting at the cellular level.
When I began incorporating NAD+ repletion — through IV infusions and oral precursors — I saw things I couldn’t explain through conventional frameworks. Energy returned. Hormone therapy began landing the way it was designed to. Patients on GLP-1 medications described a cellular wakefulness they hadn’t felt in years. NAD+ doesn’t do one thing; it amplifies the effectiveness of nearly everything else we are doing, because it restores the energy economy of the cell itself.
MOTS-c: The Mitochondrial Hormone That Reframes Weight Loss
MOTS-c is a peptide encoded within the mitochondrial genome — not the nuclear genome, but the mitochondria’s own ancient DNA. When released, it travels to skeletal muscle and metabolic tissues and recalibrates how cells handle glucose and fat. It activates AMPK, the cellular energy sensor, shifting the body away from glucose dependence and toward fat oxidation. It improves insulin sensitivity and supports healthy body composition even under metabolic stress.
What MOTS-c represents conceptually is just as important as what it does clinically. The mitochondria are not passive power plants. They are active endocrine organs, sending signals that shape how the entire body uses energy. For patients who have struggled with weight despite doing everything right, this matters enormously — because their challenge was never willpower. It was cellular readiness.
SS-31: Protecting the Architecture of Energy
If NAD+ fuels the mitochondria and MOTS-c teaches the cell to use energy wisely, SS-31 protects the structural integrity of the mitochondria themselves. The inner mitochondrial membrane — where ATP production actually occurs — depends on a lipid called cardiolipin. Oxidative stress damages cardiolipin with age, and when the architecture deteriorates, energy production declines not because the parts are gone, but because the structure holding them together has failed.
SS-31 selectively concentrates in the inner mitochondrial membrane, stabilizes cardiolipin, and restores mitochondrial architecture. Patients report better stamina, faster recovery, and less of the inflammatory ache that had quietly been normalized as simply getting older.
We are not just slowing the clock. We are restoring the machinery the clock was running down.
What This Actually Means
Longevity medicine, as I practice it, is not about living forever. It is about compressing the morbidity curve — spending the years between 60 and 90 as close as possible to full vitality and full engagement with the people and work you love. The mitochondria are the thread that runs through all of it. Hormone optimization, weight loss, brain health, cardiovascular resilience — these are not separate conversations. They are one conversation, and it happens at the level of the cell.
If you have been told your labs are normal and your symptoms are simply aging, I want you to understand: those two things can both be true and still be incomplete. Normal labs don’t tell you whether your cells are energetically capable of a vibrant life. At The Gajer Practice, that is exactly what we look for — and exactly what we treat.
Dr. Aleksandra Gajer
Founder, The Gajer Practice | Burke, Virginia
Board-Certified Physician | Functional & Performance Medicine
