Boosting testosterone naturally: What your body really needs
What is Testosterone, and Why Does Nutrition Play Such a Big Role?
Testosterone is far more than just a sex hormone. It influences muscle mass, energy levels, mood, bone density, sleep quality and cognitive performance. In short, it is one of the central hormones for male vitality, and its levels begin to decline slowly from around the age of 30. According to the Massachusetts Male Aging Study and the Baltimore Longitudinal Study of Aging, this decline averages approximately 1 to 2 % per year (Travison et al., 2007; Harman et al., 2001). What many people do not know is that nutrition is one of the most influential factors shaping hormonal status over the long term. This article explains how testosterone is produced, which nutrients play a documented role in that process, and why animal-based whole foods are a particularly dense source of those nutrients.
What is Testosterone?
Testosterone belongs to the group of androgens and is produced primarily in the Leydig cells of the testes. Regulation occurs via the hypothalamic-pituitary-gonadal axis (HPG axis): the hypothalamus sends the signal, the pituitary gland responds, and the testes produce testosterone. This system is finely tuned and responds to a wide range of internal and external influences, including sleep, stress levels and nutrition.
Testosterone is responsible for, among other things:
• Building and maintaining muscle mass and strength
• Regulating bone density
• Production of red blood cells
• Mood, motivation and cognitive sharpness
• Libido and sexual health
• Fat metabolism and body composition
A persistently low testosterone level can manifest in symptoms such as chronic fatigue, mood swings, reduced physical performance and a general sense of not being quite yourself anymore. Hormonal fluctuations are not necessarily pathological; lifestyle and nutritional factors are often the underlying cause, and these can be actively addressed.
What Influences Testosterone Levels?
The HPG axis responds to a range of factors. Some of these can be actively influenced:
1. Sleep:
• The majority of daily testosterone secretion takes place during sleep. A study from the University of Chicago showed that one week of sleep restriction to under 5 hours reduced testosterone levels in young healthy men by 10 to 15 % (Leproult & Van Cauter, 2011). A further study found that sleep duration is one of the strongest independent predictors of testosterone levels in older men (Penev, 2007). Quality sleep is therefore not a minor consideration, it is a fundamental hormonal requirement.
2. Physical Activity:
• Strength training, particularly compound exercises such as squats and deadlifts, stimulates acute testosterone release and supports a healthy hormonal status over time. A meta-analysis from 2021 confirmed that regular strength training significantly improves resting testosterone levels in inactive men (Potter et al., 2021). According to Vingren et al. (2010), testosterone is the most important natural driver of muscle growth and strength in response to resistance training.
3. Stress and Cortisol:
• Chronically elevated cortisol directly inhibits the activity of the HPG axis. Testosterone and cortisol have an antagonistic relationship: sustained psychological or physical stress can measurably lower testosterone levels. Active stress regulation therefore has not only mental benefits but direct hormonal consequences.
4. Nutrition and Nutrient Supply:
• Testosterone is a steroid hormone, and its synthesis depends on cholesterol as a starting material and on a range of micronutrients as cofactors. When these building blocks are missing, production slows down. This is where the quality of daily nutrition plays a decisive role.
The Nutrients the Body Needs for Hormone Synthesis
Several micronutrients act as cofactors in the enzyme cascade involved in testosterone synthesis. The following are among the most well-documented:
1. Zinc:
• Zinc is involved in the regulation of aromatase, the enzyme that converts testosterone into oestrogen, and plays a direct role in the signalling pathway of the Leydig cells. A systematic review from 2023 covering 38 studies confirmed a significant positive correlation between zinc status and testosterone levels (Te et al., 2023). A classic intervention study also showed that deliberate zinc restriction in young men drastically lowered testosterone levels, and that supplementation in zinc-deficient men restored those levels (Prasad et al., 1996). The EFSA confirms that zinc contributes to the maintenance of normal testosterone levels in the blood.
2. Vitamin D:
• Vitamin D is, strictly speaking, a steroid hormone. Vitamin D receptors are expressed directly in the Leydig cells, which points to a role in hormone synthesis. A placebo-controlled RCT showed that vitamin D supplementation led to a significant increase in total testosterone (Pilz et al., 2011). A meta-analysis from 2024 covering 17 clinical studies confirmed this finding (D'Andrea et al., 2024). Since vitamin D is produced primarily through sunlight and is widely deficient in Central Europe, particularly during the winter months (Hu et al., 2022), targeted supplementation is especially relevant.
3. Vitamin A (Retinol):
• Retinol, the animal form of vitamin A, is involved in steroidogenesis, the biochemical process by which cholesterol is converted into steroid hormones. Unlike plant-derived beta-carotene, retinol is directly usable by the body; the conversion rate of beta-carotene to retinol in humans is highly variable and often inefficient. Beef liver is one of the richest natural sources of retinol.
4. Iron:
• According to the EFSA, iron contributes to the reduction of tiredness and fatigue and supports normal energy production. An adequate iron status is therefore an important foundation for vitality and physical performance, two factors that are directly linked to a healthy hormonal status. Haem iron from animal sources is absorbed by the body far more efficiently than non-haem iron from plant sources.
5. Selenium:
• Selenium is a powerful antioxidant and, according to the EFSA, contributes to the protection of cells from oxidative stress. Since the Leydig cells operate in an environment of high metabolic activity, protection against oxidative stress is particularly relevant there. Beef organs, especially kidney and liver, are natural sources of selenium with high bioavailability.
Why Animal Organs are an Exceptionally Dense Nutrient Source
Muscle meat is only one part of the animal, and not the most nutritionally rich. Organs such as liver, heart and kidney concentrate nutrients at a density and bioavailability that muscle meat cannot match. The principle behind this is known as nose-to-tail eating, the practice of using the whole animal. Those who eat only muscle meat cover just part of the nutritional spectrum.
An overview of key nutrients by organ:
• Beef liver: Vitamin A (retinol), B12, iron, copper, selenium. Contributes to normal energy metabolism and immune function
• Beef testicles: Zinc, selenium, high-quality proteins. Zinc contributes to the maintenance of normal testosterone levels according to the EFSA
• Beef heart: CoQ10, L-carnitine, B vitamins. Supports normal heart function and energy production
• Beef kidney: Selenium, B12, riboflavin. Contributes to the protection of cells from oxidative stress
• Beef spleen: Haem iron, vitamin C. Iron contributes to the reduction of tiredness and fatigue
Anyone who wants to ensure they are getting sufficient zinc, retinol, selenium and iron in bioavailable form should incorporate animal whole foods, and ideally also organs, into their diet. This was standard practice for thousands of years. In modern food culture, it is unfortunately the exception. Freeze-dried organ supplements in capsule form are a practical way to fill this nutritional gap, without preparation, without any taste barrier, with full retention of nutrients through the freeze-drying process.
Frequently Asked Questions
1. Can I change my testosterone levels through nutrition alone?:
• Nutrition is a relevant factor, but not an isolated one. It provides the nutritional foundation the body needs for a functioning hormonal system. Whether and to what extent changes occur depends on the individual starting point, in particular whether any deficiencies are present. Anyone who suspects a genuinely low testosterone level should have it checked by a doctor.
2. Are organ supplements safe?:
• Freeze-dried beef organs from certified organic pasture-raised cattle are a natural food concentrate without synthetic additives. As with all dietary supplements, the recommended daily dose should be observed, and anyone with existing medical conditions or taking medication should consult a doctor or pharmacist beforehand.
3. From what age is this topic relevant?:
• The hormonal decline begins gradually, and paying early attention to nutrition and lifestyle pays off over the long term. There is no magic age; preventive measures are effective at any point in life, and good nutritional status is beneficial at every stage.
Conclusion: Men's Health Starts on the Plate
Testosterone is not an isolated topic, it is a reflection of the overall lifestyle. Sleep, exercise and nutrition form the foundation on which hormonal health is built. Within nutrition, it is above all the micronutrients: zinc, vitamin D, retinol, selenium and iron, that play a documented role as cofactors in hormone synthesis.
All of our beef organ supplements are 100 % natural, sourced from pasture-raised, grass-fed organic cattle, ensuring you receive these nutrients in their most bioavailable form, not synthetically produced. Visit our shop and discover a range of natural beef organ supplements, including our Beef Liver, Beef Testicle Complex and Beef Organ Complex. These products offer a high concentration of the nutrients described above, as well as further essential micronutrients to support your health and vitality.
References:
• Travison, T. G. et al. (2007). A Population-Level Decline in Serum Testosterone Levels in American Men. Journal of Clinical Endocrinology & Metabolism. Retrieved from https://pubmed.ncbi.nlm.nih.gov/17062768/
• Harman, S. M. et al. (2001). Longitudinal effects of aging on serum total and free testosterone levels in healthy men. Baltimore Longitudinal Study of Aging. Journal of Clinical Endocrinology & Metabolism. Retrieved from https://pubmed.ncbi.nlm.nih.gov/11158037/
• Leproult, R. & Van Cauter, E. (2011). Effect of 1 Week of Sleep Restriction on Testosterone Levels in Young Healthy Men. JAMA. Retrieved from https://pubmed.ncbi.nlm.nih.gov/21632481/
• Penev, P. D. (2007). Association between sleep and morning testosterone levels in older men. Sleep. Retrieved from https://pubmed.ncbi.nlm.nih.gov/17520786/
• Te, L. et al. (2023). Correlation between serum zinc and testosterone: A systematic review. Journal of Trace Elements in Medicine and Biology. Retrieved from https://pubmed.ncbi.nlm.nih.gov/36577241/
• Prasad, A. S. et al. (1996). Zinc status and serum testosterone levels of healthy adults. Nutrition. Retrieved from https://pubmed.ncbi.nlm.nih.gov/8875519/
• Pilz, S. et al. (2011). Effect of vitamin D supplementation on testosterone levels in men. Hormone and Metabolic Research. Retrieved from https://pubmed.ncbi.nlm.nih.gov/21154195/
• D'Andrea, S. et al. (2024). The Impact of Vitamin D on Androgens among Adult Males: A Meta-Analytic Review. Nutrients. Retrieved from https://pmc.ncbi.nlm.nih.gov/articles/PMC11506788/
• Vingren, J. L. et al. (2010). Testosterone physiology in resistance exercise and training. Sports Medicine. Retrieved from https://pubmed.ncbi.nlm.nih.gov/21058750/
• Potter, J. A. et al. (2021). Effects of exercise training on resting testosterone in men: meta-analysis. Journal of Strength and Conditioning Research. Retrieved from https://pubmed.ncbi.nlm.nih.gov/35134000/
• Hu, Y. et al. (2022). Association Between Vitamin D Deficiency and Testosterone Levels in Adult Males: Systematic Review. Cureus. Retrieved from https://pmc.ncbi.nlm.nih.gov/articles/PMC10518189/