What is CoQ10 and do women need it?

CoQ10 — coenzyme Q10 — is a compound the body produces naturally and concentrates in its most energy-demanding organs: the heart, liver, kidneys, and brain. It sits in the inner mitochondrial membrane and is required for electron transfer through the electron transport chain — the final stage of cellular ATP production. Without adequate CoQ10, that chain runs below capacity, and the result is reduced cellular energy output that manifests as fatigue, reduced physical resilience, and slower cognitive recovery. The challenge for women is twofold: CoQ10 production declines with age, beginning in the 30s and accelerating thereafter, and the richest dietary sources — organ meats that previous generations ate regularly — have largely disappeared from the modern diet. For women navigating the energy and hormonal shifts that begin in their mid-30s and continue through perimenopause, CoQ10 is worth understanding — and the form it comes in matters more than most supplement labels acknowledge.

What CoQ10 actually does in the body

ATP — adenosine triphosphate — is the molecule the body uses as its primary energy currency. It powers muscle contraction, neurotransmitter synthesis, immune response, and every other energy-requiring cellular process. Mitochondria produce ATP through the electron transport chain, a series of protein complexes embedded in the inner mitochondrial membrane. CoQ10 shuttles electrons between Complex I and Complex III of that chain, and between Complex II and Complex III. Without functional CoQ10 at sufficient concentrations, electron transfer slows, the proton gradient that drives ATP synthase weakens, and ATP output falls.

CoQ10 also functions as a fat-soluble antioxidant in cell membranes and lipoproteins, protecting mitochondrial membrane integrity from the oxidative stress that accumulates with age and chronic stress. According to a review published via PMC (NIH), CoQ10 levels decline in some tissues during aging, and supplementation has shown benefits particularly under conditions of increased oxidative stress. The paper describes CoQ10 as essential for linking metabolic pathways to mitochondrial energy production — a role that becomes progressively more vulnerable as endogenous production falls.

When does CoQ10 decline — and why it matters for women

The body's endogenous CoQ10 production peaks in the 20s and begins a gradual decline that accelerates in the 40s and beyond. This is not a minor fluctuation — tissue CoQ10 concentrations in the heart and other high-energy organs measurably decrease with age. The organs most dependent on sustained high-level ATP production — heart, brain, skeletal muscle — feel the deficit in energy output, recovery capacity, and oxidative stress resilience.

For women, the decline in CoQ10 occurs alongside the perimenopausal hormonal transition, which itself affects mitochondrial function independently. Estrogen has been shown to support mitochondrial biogenesis — the process by which cells generate new mitochondria — and as estrogen falls, mitochondrial efficiency can decrease. The two processes compound each other: CoQ10 production declines with age at the same time mitochondrial efficiency is being reduced by declining estrogen. The result is a cellular energy landscape in midlife that is genuinely different from a woman's 20s — and not simply because she is busier or sleeping less.

A further consideration specific to women: CoQ10 plays a documented role in oocyte energy metabolism. Research published via PMC (NIH) found that aging of the female germ line is accompanied by mitochondrial dysfunction and reduced ATP production, and that diminished expression of CoQ-producing enzymes was observed in oocytes of older females. CoQ10 administration reversed age-related oocyte decline in the study model. This is a preconception-relevant finding, not only an energy-support finding — CoQ10 is relevant to female physiology at multiple levels.

Whole-food CoQ10 versus synthetic supplements

Isolated CoQ10 supplements — typically ubiquinone (the oxidized form) or ubiquinol (the reduced, active form) — are widely available and have a legitimate evidence base for specific conditions. The question for women using CoQ10 as part of a broader nutritional wellness routine is not whether supplemental CoQ10 is valid, but whether whole-food-sourced CoQ10 offers advantages that an isolated supplement does not.

The case for whole-food sourcing rests on the nutrient matrix. Beef heart — the richest dietary source of CoQ10, at approximately 11.3 mg per 100 grams — delivers CoQ10 alongside B-vitamins, heme iron, essential amino acids, and the full cofactor context that mitochondrial energy production depends on. Isolated synthetic CoQ10 delivers the single compound, without the B12 that supports the methylation cycle, without the iron that hemoglobin requires for oxygen delivery to mitochondria, and without the complete amino acid profile that supports mitochondrial protein synthesis.

A review of CoQ10 supplementation in aging and disease published via PMC (NIH) notes that CoQ10 is an essential component of the mitochondrial electron transport chain, and that lower CoQ10 levels are detected in chronic disease and aging — with supplementation showing benefit particularly when combined with addressing the broader metabolic environment. The whole-food approach addresses that broader environment alongside the CoQ10 itself.

"The Beef Organ Complex came from a genuine belief that women deserve whole-food nutrition — not just a list of isolated nutrients in a capsule. We built it because the nutritional wisdom in these foods is real, and women deserve access to it in a form that fits their lives."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

Why beef heart is the anchor of this equation

The heart is a muscle that contracts continuously, without rest, from before birth until death. It requires the highest sustained ATP output of any organ in the body, which means it maintains exceptionally high concentrations of CoQ10 to keep the mitochondrial electron transport chain running. At approximately 11.3 mg per 100 grams, beef heart contains more CoQ10 than any other whole food — including liver (approximately 3.9 mg per 100 grams), sardines (approximately 6.4 mg per 100 grams), and regular beef muscle meat (approximately 3.1 mg per 100 grams).

What makes beef heart particularly relevant as a food source — rather than simply a CoQ10 delivery vehicle — is that it arrives alongside B12, B-vitamins, heme iron, essential amino acids, and taurine. These are not incidental co-passengers. They are the cofactors the mitochondrial system depends on. B12 supports the methylation cycle. Iron supports hemoglobin and oxygen delivery. B-vitamins serve as electron carriers at multiple steps in the energy chain. The food matrix delivers the system context, not just the headline compound.

For a detailed look at CoQ10 concentration across food sources and the mechanism of why heart concentrates it so highly, see our guide on what CoQ10 is and why it comes from beef heart.

What Beef Organ Complex delivers

Beef Organ Complex, a whole-food blend of grass-fed liver, heart, kidney, and female-focused organ powders, is the practical form of this nutrition for women who are not regularly eating organ meats.† Sourced from 100% grass-fed, grass-finished, pasture-raised cattle with no added hormones:

• Bovine heart powder: Supplies naturally occurring CoQ10, B-vitamins, and essential amino acids that support cellular energy metabolism.†
• Bovine liver powder: Supplies naturally occurring heme iron, B12, vitamin A, choline, and copper — cofactors for oxygen delivery, methylation, and red blood cell production.†
• Bovine kidney powder: Supplies naturally occurring selenium and B12, supporting antioxidant status and nervous system function.†
• Female-focused organ powders (bovine uterus and ovary): Supply naturally occurring bioactive nutrients traditionally valued in ancestral and functional nutrition to support women through hormonal changes.†

Pink Stork Beef Organ Complex is the first beef organ supplement in the category to earn the Clean Label Project Purity Award, following ISO-accredited third-party laboratory testing for more than 400 environmental and industrial contaminants. It was formulated with input from an expert advisory panel of OB/GYNs and registered dietitians. It is backed by 50,000+ verified Amazon reviews across the Pink Stork brand.

For women in their late 30s and 40s where the NAD+ pathway is also relevant to cellular energy alongside CoQ10, our NAD+ supplement with 500 mg clinically studied NR supports the parallel NAD+-dependent mitochondrial energy production pathway.†

For a complete picture of why persistent fatigue may not be a sleep problem, see our guide on why you are still tired even when you get enough sleep.

Frequently asked questions

Do women need CoQ10?

The body produces CoQ10 naturally, but production declines with age beginning in the 30s. For women in their mid-30s through perimenopause, declining CoQ10 coincides with hormonal changes that independently affect mitochondrial efficiency. Ensuring adequate CoQ10 through diet — including whole-food sources like organ meats — or supplementation supports the mitochondrial energy system at a point when it becomes increasingly vulnerable.†

What are the best food sources of CoQ10?

Beef heart is the most concentrated dietary source at approximately 11.3 mg per 100 grams. Other organ meats — liver, kidney — follow, alongside oily fish such as sardines (approximately 6.4 mg per 100 grams) and mackerel. Regular muscle meat and plant sources contain substantially lower amounts. The near-disappearance of organ meats from modern Western diets has removed the primary whole-food CoQ10 source from most women's plates.

Is whole-food CoQ10 better than a supplement?

Isolated CoQ10 supplements (ubiquinone or ubiquinol) have a legitimate research base for specific conditions. The advantage of whole-food-sourced CoQ10 is the nutrient matrix — beef heart delivers CoQ10 alongside B-vitamins, heme iron, amino acids, and other mitochondrial cofactors that are absent from isolated supplements. For general wellness and energy support, the whole-food form provides system-level context that an isolated compound does not.†

Does CoQ10 decline with age?

Yes. Endogenous CoQ10 production peaks in the 20s and measurably declines in the 30s and beyond, with the decline most pronounced in high-energy organs like the heart and brain. This is documented in peer-reviewed research and is one of the primary reasons CoQ10 supplementation has been studied in the context of healthy aging and age-related energy decline.

Can a beef organ supplement replace a CoQ10 supplement?

A beef organ supplement provides naturally occurring CoQ10 from bovine heart in whole-food form — not as a pharmaceutical-dose isolated compound. The concentrations from a standard serving of a beef organ supplement are lower than what clinical trials typically use for specific conditions (100–300 mg isolated CoQ10 daily). For general wellness and nutritional support, whole-food organ nutrition provides meaningful CoQ10 alongside the cofactor matrix. For higher-dose therapeutic applications, that is a conversation for a healthcare provider.†

Is a beef organ supplement safe during pregnancy?

Beef organ supplements contain preformed vitamin A (retinol) from liver. Excessive retinol intake is contraindicated during pregnancy. Always consult your healthcare provider before taking any beef organ supplement during pregnancy or breastfeeding. For pregnancy-specific nutritional support, a prenatal vitamin with methylated folate and iron bisglycinate is the appropriate foundation.†

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.