Several things deplete coenzyme Q10, but the most common culprits are statin medications and aging. Your body produces most of its own CoQ10, roughly 500 mg per day, while food contributes only about 5 mg. That means anything that disrupts your body’s internal production has a far bigger impact than diet alone.
Statin Medications Are the Biggest Offender
Statins lower cholesterol by blocking an enzyme called HMG-CoA reductase. The problem is that this same enzyme sits on the production pathway for CoQ10. When statins shut it down to reduce cholesterol, they also cut off a key ingredient your body needs to make CoQ10. Clinical trials show that statin therapy reduces circulating CoQ10 levels by 16% to 54%, regardless of the specific statin used, the dose, or how long you take it. This is one reason some people on statins develop muscle pain and fatigue, symptoms that overlap with what you’d expect from lower CoQ10 in muscle tissue.
Red yeast rice, a supplement some people take as a “natural” alternative to statins, works through the same enzyme pathway and can reduce CoQ10 levels in the same way.
Other Medications That Lower CoQ10
Statins get the most attention, but they aren’t the only drugs that affect CoQ10 status. Beta-blockers, commonly prescribed for high blood pressure and heart rhythm issues, and tricyclic antidepressants have both been identified as medications that may reduce CoQ10 levels. The mechanism isn’t as well characterized as with statins, but the pattern is consistent enough that integrative medicine programs at institutions like the University of Wisconsin flag these drug classes as worth monitoring.
Your Body Makes Less After Age 25
CoQ10 production peaks around age 25, then gradually declines. The drop isn’t trivial. By age 65, your heart tissue produces roughly half the CoQ10 it did at 25. The rate of decline varies by organ, but the overall trend is consistent: the older you get, the less CoQ10 your body manufactures on its own. This matters because CoQ10 plays a central role in how your cells generate energy, particularly in organs with high energy demands like the heart, kidneys, and liver.
This age-related decline is a slow process, not something you’d notice from one year to the next. But it compounds over decades, and it helps explain why CoQ10 supplementation is more commonly discussed for older adults.
Missing Nutritional Building Blocks
Your body assembles CoQ10 from scratch using amino acids (tyrosine and phenylalanine), plus several vitamins as helpers along the way. Two B vitamins play specific roles. Vitamin B5 (pantothenic acid) is the precursor to a molecule called coenzyme A, which feeds into CoQ10’s side chain. Vitamin B6 is required for the very first step in building CoQ10’s core ring structure, converting tyrosine into the starting material your cells need.
If your diet is low in these B vitamins or in the amino acids tyrosine and phenylalanine, your body’s CoQ10 factory runs less efficiently. This doesn’t mean a single skipped meal matters, but chronic nutritional gaps, especially in older adults or people on restrictive diets, can compound the problem.
Type 2 Diabetes and Oxidative Stress
People with type 2 diabetes tend to have lower CoQ10 levels. The likely reason is that the chronic oxidative stress and inflammation that come with poorly controlled blood sugar burn through CoQ10 faster than the body can replace it. CoQ10 doubles as an antioxidant, so when your body is under sustained oxidative pressure, it uses up its CoQ10 stores for defense rather than energy production.
This same principle applies to other conditions that generate high levels of oxidative stress. The body’s CoQ10 supply isn’t just about production; it’s also about consumption. Anything that increases free radical activity in your cells can tip the balance.
Intense Physical Training
Hard exercise increases both metabolic stress and free radical production in muscle tissue. Athletes during periods of intense training may experience temporary drops in muscle CoQ10 as the body uses it up faster. This is a demand-side problem rather than a production problem, and it’s typically most relevant for people doing sustained, high-intensity work rather than moderate recreational exercise.
Rare Genetic Conditions
A small number of people have genetic mutations that directly impair CoQ10 production. Primary CoQ10 deficiency involves mutations in any of ten genes responsible for building the molecule. These conditions are rare and typically show up in childhood, presenting as neurological problems, kidney disease, or severe muscle weakness. Secondary CoQ10 deficiency can also result from genetic mutations affecting the mitochondrial respiratory chain more broadly, even when the CoQ10 genes themselves are normal.
These genetic conditions are fundamentally different from the situational depletion most people experience from medications or aging. They require specialized diagnosis and targeted supplementation under medical supervision.
What About Smoking?
Smoking is often listed as a CoQ10 depleter, and the logic seems sound: cigarettes generate massive oxidative stress, and CoQ10 is an antioxidant that should get used up fighting it. But the research tells a more nuanced story. A study of healthy European adults found that neither the number of cigarettes smoked per day nor smoking status itself significantly affected CoQ10 levels when adjusted for cholesterol. Long-term smokers actually showed higher adjusted CoQ10 concentrations, likely as an adaptive response where the body ramps up antioxidant defenses over time. So while smoking is destructive in many ways, the evidence for direct CoQ10 depletion is weaker than commonly claimed.
Why Depletion Matters
CoQ10 sits inside your mitochondria, the energy-producing structures in every cell. It shuttles electrons during the process that converts food into usable energy. When levels drop, cells with the highest energy needs feel it first: heart muscle, skeletal muscle, and the brain. Common symptoms associated with low CoQ10 include fatigue, muscle weakness, and muscle pain, though these overlap with many other conditions.
If you’re taking a statin, are over 60, or fall into multiple categories on this list, your CoQ10 levels are more likely to be lower than optimal. CoQ10 supplements are widely available and generally well absorbed, though the body’s uptake varies depending on the formulation and whether you take it with food containing fat.