For many men, crossing fifty is a moment when the body starts sending clear signals of hormonal changes. Chronic fatigue, decreased motivation, concentration problems, and changes in physique – all this can be related to andropause, the natural process of decreasing testosterone levels. Unlike female menopause, andropause develops gradually and is often trivialized as natural aging. The truth, however, is that we don't have to passively watch these changes affect our quality of life.
What Is Andropause and Why Should You Know About It?
Andropause, also referred to as Androgen Deficiency in Aging Males (ADAM) or Late-Onset Hypogonadism (LOH), is a life phase associated with gradual decline in testosterone levels. Research shows that after age 30, production of this hormone decreases by an average of 1-2% annually, and this process accelerates after age 50. It's estimated that andropause symptoms affect about 20-30% of men in their seventh decade of life, and after age 80, even 50% of men show biochemical signs of androgen deficiency.
Testosterone is not just a hormone responsible for libido and sexual functions. Its role in the body is much broader – it regulates metabolism, affects muscle mass and bone density, influences mood, life energy, and cognitive functions. Testosterone deficiency can therefore lead to a range of ailments that significantly reduce quality of life.
Most Common Symptoms of Andropause
Symptoms of testosterone deficiency can be varied. Clinical studies indicate the following most common ailments:
- Chronic fatigue – feeling of exhaustion even after good sleep, difficulty performing daily tasks (89% of men in study)
- Decreased libido and erectile dysfunction – reduced sexual drive (91%), problems achieving or maintaining erection (79%)
- Changes in physique – fat tissue accumulation around abdomen, loss of muscle mass
- Mood deterioration – irritability, mood decline (68%), sometimes depressive symptoms
- Concentration and memory problems – so-called brain fog, difficulty focusing (77%)
- Bone weakening – increased risk of osteoporosis and fractures
- Sleep disorders – insomnia, frequent night waking
- Decreased endurance – deterioration of physical performance (66%)
Natural Methods of Supporting Testosterone – Foundation of Hormonal Health
The good news is that there are proven, natural methods of supporting testosterone levels that don't require pharmacological intervention. Before we reach for hormone replacement therapy, it's worth investing in lifestyle changes that can bring significant improvement.
1. Diet Supporting Testosterone Production
What we eat has a direct impact on hormonal economy. A testosterone-boosting diet should be rich in the following components:
Healthy Fats
Testosterone is a steroid hormone synthesized from cholesterol, so adequate supply of healthy fats is crucial. Sources:
- Avocado – rich in monounsaturated fatty acids
- Extra virgin olive oil – contains polyphenols and healthy fats
- Nuts and seeds – almonds, walnuts, pumpkin seeds (additionally provide zinc)
- Fatty sea fish – salmon, mackerel, sardines, herring (rich in omega-3)
- Eggs – natural source of cholesterol and vitamin D
High-Quality Protein
Adequate protein intake supports production of anabolic hormones and helps maintain muscle mass:
- Lean meat – beef, poultry
- Fish and seafood – additional source of zinc and omega-3
- Eggs – complete source of amino acids
- Dairy products – yogurt, kefir, cottage cheese
Zinc and Magnesium – Key Minerals
Research shows that zinc deficiency can lead to testosterone level decline of up to 75% within 6 months. Zinc sources include:
- Oysters and clams – best natural source
- Red meat and poultry
- Pumpkin and sunflower seeds
- Peanuts
Magnesium supports testosterone production and reduces its binding to SHBG protein, increasing the amount of free (active) testosterone. Studies show that supplementation of 450 mg magnesium daily can increase testosterone levels by 24% within 4 weeks. Found in:
- Spinach and green leafy vegetables
- Almonds and walnuts
- Dark chocolate (70% cocoa and more)
- Chia seeds and flaxseed
Cruciferous Vegetables
Broccoli, cauliflower, cabbage, and Brussels sprouts contain indole-3-carbinol, which helps maintain balance between testosterone and estrogen, supporting natural detoxification processes.
What to Avoid?
- Excess sugar and highly processed products – cause insulin spikes, which negatively affect testosterone
- Alcohol – even moderate consumption can lower testosterone levels by increasing aromatase enzyme activity
- Trans fats – present in fast foods and margarines
- Excess soy products – may affect hormonal balance
2. Physical Activity – Training as Natural Testosterone Booster
Regular physical activity is one of the most effective natural ways to support testosterone production. However, not every type of training affects this hormone in the same way.
Strength Training
Meta-analysis of studies showed that endurance training (aerobic) shows moderate effect on testosterone levels in older men (SMD = 0.398), while resistance training (strength) shows no significant effect on resting testosterone. However, high-intensity interval training (HIIT) shows promising results (SMD = 0.283).
Key principles of strength training:
- Frequency: 3-4 times per week
- Multi-joint exercises: squats, deadlifts, bench press, pull-ups
- Intensity: 70-85% maximum load (6-12 repetitions)
- Rest between sets: 90-120 seconds
- Training duration: 45-60 minutes (too long training increases cortisol)
High-Intensity Interval Training (HIIT)
Studies showed that HIIT can increase total testosterone by about 17%, with most of the increase occurring during preparatory phase (~10%), and HIIT training itself adding another ~7%. Importantly, free testosterone (biologically active form) increases by ~4.5% after HIIT program.
Example HIIT protocol:
- 20-30 minutes of training, 2-3 times per week
- Work:rest ratio 1:1 or 1:2 (e.g., 30 seconds sprint, 30-60 seconds walk)
- Intensity: 80-90% maximum heart rate during intense phases
Note: Excessive volume of endurance training (e.g., long-distance running) can lower testosterone, so moderation is advisable.
3. Sleep and Recovery
Sleep is the time when the body regenerates and produces hormones, including testosterone. Sleep deprivation can lower testosterone levels by up to 15% after just one week.
Recommendations for optimal sleep:
- Duration: 7-9 hours uninterrupted
- Regularity: go to bed and wake up at consistent times
- Sleep hygiene: dark, cool room (18-20°C), without electronic devices 1 hour before sleep
- Avoid: caffeine after afternoon, alcohol before sleep, heavy meals 2-3 hours before sleep
4. Stress Reduction
Chronic stress leads to increased cortisol production, which acts antagonistically to testosterone. High cortisol levels inhibit testosterone production in testes.
Proven stress reduction methods:
- Mindfulness meditation – 10-20 minutes daily
- Breathing techniques – 4-7-8 diaphragmatic breathing
- Nature contact – walks in park or forest
- Social support – regular contact with loved ones
- Hobbies and passions – time for enjoyable activities
Reasonable Supplementation – Support Where Diet Falls Short
Even the most balanced diet may not cover all body needs, especially for men over 50. Here are supplements with solid scientific foundations in the context of supporting hormonal health:
1. Vitamin D3 + K2
Vitamin D acts like a prohormone and is crucial for testosterone production. Vitamin D receptors are located in Leydig cells in testes, which are responsible for testosterone synthesis.
Scientific studies:
- A 2011 randomized controlled trial showed that supplementation of 3332 IU vitamin D daily for 12 months in overweight men increased total testosterone from 10.7 to 13.4 nmol/l (increase of ~25%), bioactive testosterone rose from 5.21 to 6.25 nmol/l, and free testosterone from 0.222 to 0.267 nmol/l
- Meta-analysis of 17 studies showed that vitamin D supplementation significantly increases total testosterone (WMD 0.38, 95% CI 0.06–0.70)
- Mendelian randomization analysis on 4254 men confirmed causal relationship between vitamin D level and testosterone
Vitamin K2 is an essential complement to vitamin D3, as it directs calcium to bones while protecting arteries from calcification.
Recommended dosage: 2000-4000 IU vitamin D3 + 100-200 mcg vitamin K2 (MK-7) daily. It's worth testing 25(OH)D blood level and adjusting dose (optimal level: 40-60 ng/ml).
2. Magnesium
Magnesium is a cofactor in over 300 enzymatic reactions, including testosterone production.
Scientific studies:
- A 2011 study showed that supplementation of 450 mg magnesium daily for 4 weeks increased testosterone levels by 24% in athletes and sedentary men
- Cross-sectional study on 399 men aged 65+ showed positive correlation between magnesium level and testosterone, independent of BMI, inflammation (IL-6), DHEAS, SHBG, or insulin
- Magnesium increases testosterone bioactivity by reducing its binding to SHBG
Recommended dosage: 300-450 mg daily (preferably in form of magnesium glycinate or citrate, best before sleep).
3. Zinc
Zinc is essential for testosterone production and proper Leydig cell function.
Scientific studies:
- Systematic review of studies confirmed positive correlation between zinc level and testosterone
- Zinc deficiency leads to 75% testosterone decline within 6 months
- A 2000 study showed that supplementation of 30 mg zinc daily increases free testosterone level
- A 2019 rat study showed that combination of zinc, magnesium, and selenium increased testosterone by 105% compared to control group
Recommended dosage: 15-30 mg daily (in form of zinc picolinate or citrate). Avoid doses above 40 mg daily.
4. Omega-3 Fatty Acids (EPA and DHA)
Omega-3 supports hormonal health through inflammation reduction, improved insulin sensitivity, and mitochondrial function support.
Scientific studies:
- Randomized controlled trial on overweight men showed that supplementation of 860 mg DHA + 120 mg EPA daily for 12 weeks significantly increased total testosterone. Testosterone changes correlated positively with EPA and DHA increase in erythrocyte membranes
- NHANES cross-sectional study covering 8686 men showed that omega-3 intake, especially docosapentaenoic acid (DPA), was positively correlated with testosterone level
- Japanese study on 1545 older men (60-69 years) showed that higher fish consumption correlated with higher testosterone (5.63 vs 5.99 ng/mL in highest quartile)
- Study on 1679 young Danish men showed that fish oil supplement intake was associated with 16% lower LH levels and 8% higher free testosterone to LH ratio, indicating better testicular function
Recommended dosage: 1000-2000 mg EPA+DHA daily (prefer forms with high DHA content). Take with fat-containing meal.
Interesting Fact
Docosahexaenoic acid (DHA) constitutes 97% of all omega-3 fatty acids in the brain and about 25% of its dry mass. A randomized controlled trial on overweight men showed that supplementation of 860 mg DHA + 120 mg EPA for 12 weeks significantly increased testosterone, with changes correlating positively with EPA and DHA increase in erythrocyte membranes. The mechanism works through omega-3's effect on cell membrane fluidity – deficiency leads to "rigid" membranes in Leydig cells, hindering hormonal signal transmission and testosterone synthesis. Over the last century, the omega-6 to omega-3 ratio in Western diet changed from 1:1 to even 20:1, promoting chronic inflammation. Pro-inflammatory cytokines (IL-1β, IL-6, TNF-α) inhibit hypothalamic-pituitary-gonadal axis, lowering testosterone production. Additionally, omega-3 affects conformation of albumin transporting 70% of testosterone in circulation, improving hormone bioavailability.5. B Vitamin Complex (B6, B9, B12)
B vitamins play a key role in energy metabolism, hormone synthesis, and neurological function regulation.
Vitamin B6 (pyridoxine):
- Regulates testosterone production by modulating GnRH and prolactin signaling pathways
- Acts as cofactor for over 150 enzymatic reactions
- B6 deficiency in rats led to 74% testosterone reduction (from 8.36 to 2.13 nmol/l)
- Lowers prolactin by 68%, which indirectly supports testosterone
Vitamin B12 (cobalamin):
- Men with highest B12 levels showed 56% lower risk of testosterone deficiency
- Supports energy production and mitochondrial functions
- Participates in methylation cycle, essential for hormone synthesis
Folic acid (B9):
- Supports methylation pathways protecting against oxidative stress
- Lowers homocysteine, which can disrupt testosterone production
Recommended dosage: B vitamin complex containing: B6 (10-25 mg), B12 (100-1000 mcg), folic acid (400-800 mcg).
6. Creatine
Creatine is one of the most researched supplements supporting physical performance and muscle mass. For years there were controversies regarding its effect on DHT (dihydrotestosterone) and testosterone.
Scientific studies:
- One 2009 study on 20 rugby players showed 56% DHT increase after 7 days of creatine loading (25 g/day), maintained at 40% above baseline after 14 days of maintenance dose. However, total testosterone level remained unchanged
- This study was not replicated in any subsequent studies
- A 2025 study on 38 men training with weights for 12 weeks showed no differences in DHT levels, DHT to testosterone ratio, or hair growth parameters between group taking creatine (5 g/day) and placebo
- Meta-analysis of 13 studies showed that 10 of them showed no effect of creatine on testosterone, and only 2 showed small, physiologically insignificant increases
- Five studies measuring free testosterone showed no increases
Current scientific consensus: Creatine does not increase testosterone or DHT in a clinically significant way. It works by improving phosphocreatine availability in muscles, which increases ATP production. May support cognitive functions and muscle mass maintenance.
Recommended dosage: 3-5 g daily (optional loading phase: 20 g/day for 5-7 days, then 3-5 g/day).
7. Coenzyme Q10 (Ubiquinone)
Coenzyme Q10 is a key element of mitochondrial respiratory chain and powerful antioxidant.
Scientific studies:
- Systematic review of over 30 studies (1978-2018) regarding CoQ10 and testosterone showed that CoQ10 supplementation does not directly affect testosterone levels in healthy men
- However, CoQ10 may protect against testosterone decline induced by environmental toxins or medications (protective effect)
- Studies on mice with chronic kidney disease showed that CoQ10 increased testosterone level and expression of enzymes related to its biosynthesis (StAR, 3β-HSD)
- 2024 meta-analysis showed that CoQ10 improves semen parameters (motility, concentration) in infertile men
- CoQ10 supports mitochondrial energy production, which is beneficial for testosterone-producing Leydig cells
Application: CoQ10 is particularly valuable for:
- Men taking statins (which lower CoQ10)
- Supporting mitochondrial functions and energy production
- Antioxidant protection
- Supporting heart and cardiovascular health
- Improving male fertility
Recommended dosage: 100-200 mg daily (preferably in ubiquinol form, which is better absorbed).
Comprehensive Approach – Key to Success
Supporting testosterone levels after 50 is not a single action, but a comprehensive approach to health. No supplement will replace healthy diet, regular physical activity, good sleep, and stress management. It's precisely the foundation of these four health pillars that forms the basis on which we can build further optimizations.
It's worth remembering that:
- Changes don't happen overnight – give yourself time (minimum 3-6 months)
- Supplementation should be tailored to individual needs
- Before starting supplementation, it's worth doing blood tests (testosterone level, vitamin D, magnesium, morphology)
- If symptoms are very severe, consult with doctor or endocrinologist
When to Consider Hormone Therapy?
In some cases, natural methods may be insufficient. Testosterone replacement therapy (TRT) may be indicated when:
- Blood testosterone level is significantly reduced - according to various guidelines: below 200 ng/dl (5.7 nmol/l) or 300 ng/dl (10.4 nmol/l), depending on laboratory
- Symptoms significantly affect quality of life
- Natural methods didn't bring improvement after 6-12 months
Decision about TRT should be made by doctor after thorough diagnosis and risk assessment. TRT requires regular monitoring and is not indicated for all men (e.g., with prostate or breast cancer). Studies show that TRT does not increase prostate cancer risk with proper monitoring.
Summary
Andropause is a natural stage in a man's life, but doesn't have to mean deterioration of quality of life. Through appropriate lifestyle changes – balanced diet rich in healthy fats, zinc and magnesium, regular physical activity (especially strength training and HIIT), good sleep, and stress management – we can naturally support testosterone levels and maintain vitality for many years.
Reasonable supplementation based on scientific evidence – vitamin D3+K2, magnesium, zinc, omega-3, B vitamin complex, creatine, and coenzyme Q10 – can be a valuable complement to healthy lifestyle, especially when diet doesn't cover all body needs.
Remember that every body is different, and what works for one person may not necessarily work for another. Listen to your body, be patient and consistent in action. And if you have doubts or symptoms are very severe – consult with specialist.
Hormonal health is an investment in quality of life for decades to come. It's worth investing in it today.
Bibliography and Sources
Andropause and testosterone decline
- Dandona P, Rosenberg MT. A practical guide to male hypogonadism in the primary care setting. Int J Clin Pract. 2010;64(6):682-696. https://www.ncbi.nlm.nih.gov/books/NBK216164/
- Anawalt BD, Matsumoto AM. Androgen Replacement Therapy in Men: An Evidence-Based Approach. MDText.com, Inc. 2021. https://pmc.ncbi.nlm.nih.gov/articles/PMC1472881/
- Morales A. Andropause (or symptomatic late-onset hypogonadism): Facts, fiction and controversies. Aging Male. 2004;7(4):297-303. https://www.sciencedirect.com/science/article/abs/pii/S1555415508005229
- Kumar P, Kumar N, Thakur DS, Patidar A. Andropause: Current concepts. Indian J Endocrinol Metab. 2014;18(Suppl 1):S2-S10. https://pmc.ncbi.nlm.nih.gov/articles/PMC4046605/
- Ferrara SE, Ferrara DD. Andropause: A Neglected Disease Entity. OBM Geriatrics. 2024;8(2):276. https://www.lidsen.com/journals/geriatrics/geriatrics-08-02-276
- Gray A, Feldman HA, McKinlay JB, Longcope C. Age, disease, and changing sex hormone levels in middle-aged men: results of the Massachusetts Male Aging Study. J Clin Endocrinol Metab. 1991;73(5):1016-1025. https://pubmed.ncbi.nlm.nih.gov/10958037/
Vitamin D and testosterone
- Pilz S, Frisch S, Koertke H, et al. Effect of vitamin D supplementation on testosterone levels in men. Horm Metab Res. 2011;43(3):223-225. https://pubmed.ncbi.nlm.nih.gov/21154195/
- Lerchbaum E, Obermayer-Pietsch B. Vitamin D and fertility: a systematic review. Eur J Endocrinol. 2012;166(5):765-778. https://academic.oup.com/jcem/article/102/11/4292/4096785
- Rafiq R, van Schoor NM, Sohl E, et al. Association Between Vitamin D Deficiency and Testosterone Levels in Adult Males: A Systematic Review. Cureus. 2023;15(9):e45169. https://pmc.ncbi.nlm.nih.gov/articles/PMC10518189/
- Chen C, Zhai H, Cheng J, et al. Causal Link Between Vitamin D and Total Testosterone in Men: A Mendelian Randomization Analysis. J Clin Endocrinol Metab. 2019;104(8):3148-3156. https://pubmed.ncbi.nlm.nih.gov/30896763/
- Zhu YH, Zhang GS, Liu KJ, et al. The Impact of Vitamin D on Androgens and Anabolic Steroids among Adult Males: A Meta-Analytic Review. Healthcare. 2024;12(19):228. https://www.mdpi.com/2079-9721/12/10/228
Magnesium and testosterone
- Cinar V, Polat Y, Baltaci AK, Mogulkoc R. Effects of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustion. Biol Trace Elem Res. 2011;140(1):18-23. https://link.springer.com/article/10.1007/s12011-010-8676-3
- Maggio M, Ceda GP, Lauretani F, et al. Magnesium and anabolic hormones in older men. Int J Androl. 2011;34(6 Pt 2):e594-600. https://pmc.ncbi.nlm.nih.gov/articles/PMC3958794/
- Sahin RI, Yildiz N. The Effect of Magnesium, Zinc, and Selenium, Used Alone or in Combination, on Strength and Anabolic Hormone Levels in Rats. FASEB J. 2019;33(1_supplement):839.7. https://faseb.onlinelibrary.wiley.com/doi/full/10.1096/fasebj.2019.33.1_supplement.839.7
Zinc and testosterone
- Te L, Liu J, Ma J, Wang S. Correlation between serum zinc and testosterone: A systematic review. J Trace Elem Med Biol. 2023;76:127124. https://www.sciencedirect.com/science/article/abs/pii/S0946672X22002048
- Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ. Zinc status and serum testosterone levels of healthy adults. Nutrition. 1996;12(5):344-348.
- Brilla LR, Conte V. Effects of a novel zinc-magnesium formulation on hormones and strength. J Exerc Physiol Online. 2000;3(4):26-36. https://asep.org/asep/asep/BrillaV2.PDF
- Wilborn CD, Kerksick CM, Campbell BI, et al. Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism. J Int Soc Sports Nutr. 2004;1(2):12-20. https://pmc.ncbi.nlm.nih.gov/articles/PMC2129161/
Omega-3 and testosterone
- Abbott K, Burrows TL, Acharya S, Thota RN, Garg ML. Dietary supplementation with docosahexaenoic acid rich fish oil increases circulating levels of testosterone in overweight and obese men. Prostaglandins Leukot Essent Fatty Acids. 2020;163:102204. https://pubmed.ncbi.nlm.nih.gov/33221700/
- Su F, Ren J, Zhang J, et al. Association Between Dietary Intake of Omega-3 Fatty Acids and Serum Testosterone in Adult Males: Results From NHANES 2011-2016 and 2021-2023. Food Sci Nutr. 2025;13:e71062. https://onlinelibrary.wiley.com/doi/full/10.1002/fsn3.71062
- Ito K, Kawakami R, Murakami H, et al. Association between Fish Intake and Serum Testosterone Levels in Older Males: The Hitachi Health Study II. Nutrients. 2024;16(7):1045. https://pmc.ncbi.nlm.nih.gov/articles/PMC10997911/
- Safarinejad MR. Effect of omega-3 polyunsaturated fatty acid supplementation on semen profile and enzymatic anti-oxidant capacity of seminal plasma in infertile men with idiopathic oligoasthenoteratospermia: a double-blind, placebo-controlled, randomised study. Andrologia. 2011;43(1):38-47. https://pmc.ncbi.nlm.nih.gov/articles/PMC8260291/
Creatine and testosterone
- van der Merwe J, Brooks NE, Myburgh KH. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clin J Sport Med. 2009;19(5):399-404. https://pubmed.ncbi.nlm.nih.gov/19741313/
- Forbes SC, Candow DG, Ostojic SM, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021;18(1):13. https://pmc.ncbi.nlm.nih.gov/articles/PMC7871530/
- Candow DG, Forbes SC, Ostojic SM, et al. Does creatine cause hair loss? A 12-week randomized controlled trial. J Int Soc Sports Nutr. 2025;22(1):2495229. https://pubmed.ncbi.nlm.nih.gov/40265319/
Coenzyme Q10 and testosterone
- Banihani SA. Effect of Coenzyme Q10 Supplementation on Testosterone. Biomolecules. 2018;8(4):172. https://pubmed.ncbi.nlm.nih.gov/30551653/
- Lee BY, Yamaguchi K, Tanaka M, et al. Does Coenzyme Q10 Supplementation Improve Testicular Function and Spermatogenesis in Male Mice with Chronic Kidney Disease? Biology. 2021;10(8):786. https://pmc.ncbi.nlm.nih.gov/articles/PMC8389647/
- Alahmar AT, Naemi RO. Does coenzyme Q10 affect male fertility and sex hormones? A systematic review and meta-analysis of randomized controlled trials. Front Pharmacol. 2024;15:1497930. https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2024.1497930/full
B vitamins and testosterone
- Banihani SA. Role of Vitamin B6 in Testosterone Synthesis. World J Mens Health. 2025 (epub ahead of print). https://pubmed.ncbi.nlm.nih.gov/40583024/
- Symes EK, Bender DA, Bowden JF, Coulson WF. Increased target tissue uptake of, and sensitivity to, testosterone in the vitamin B6 deficient rat. J Steroid Biochem. 1984;20(5):1089-1093. https://pubmed.ncbi.nlm.nih.gov/6727359/
- Colagar AH, Marzony ET, Chaichi MJ. Zinc levels in seminal plasma are associated with sperm quality in fertile and infertile men. Nutr Res. 2009;29(2):82-88.
Training and testosterone
- Rasmussen RS, Midttun M, Zerahn B, et al. Testosterone and resistance training improved physical performance and reduced fatigue in frail older men: 1 year follow-up of a randomized clinical trial. Aging Male. 2024;27(1):2403519. https://pubmed.ncbi.nlm.nih.gov/39289825/
- Kraemer WJ, Ratamess NA. Hormonal responses and adaptations to resistance exercise and training. Sports Med. 2005;35(4):339-361. https://journals.physiology.org/doi/full/10.1152/jappl.1999.87.3.982
- Hayes LD, Herbert P, Sculthorpe NF, Grace FM. Short-Term Exercise Training Inconsistently Influences Basal Testosterone in Older Men: A Systematic Review and Meta-Analysis. Front Physiol. 2018;9:1878. https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2018.01878/full
- Herbert P, Hayes LD, Sculthorpe NF, Grace FM. Exercise training improves free testosterone in lifelong sedentary aging men. Endocr Connect. 2017;6(5):306-310. https://pmc.ncbi.nlm.nih.gov/articles/PMC5510446/
- Potter NJ, Tomkinson GR, Dufner TJ, et al. Effects of exercise training on resting testosterone concentrations in insufficiently active men: a systematic review and meta-analysis. J Strength Cond Res. 2021;35(12):3521-3528. https://pubmed.ncbi.nlm.nih.gov/35134000/
- Hayes LD, Grace FM, Baker JS, Sculthorpe N. Exercise-induced responses in salivary testosterone, cortisol, and their ratios in men: a meta-analysis. Sports Med. 2015;45(5):713-726.