You have cleaned up your diet. You walk, lift, season and supplement with intention. You eat your roots, your brassicas, your fruits, your algae and your whole grains. You know which minerals matter and which pills are a waste of money.
But hormones, peptides and steroids are another story entirely.
The marketing is seductive. “Optimise your testosterone.” “Boost your GH.” “Heal your joints with BPC‑157.” “Defy ageing with rapamycin.” The clinics, the bodybuilding forums and the longevity influencers all make the same pitch: your natural levels are inadequate, and the answer is a prescription, a needle or a pill.
Sometimes that is true. Clinical hypogonadism is real, and properly supervised testosterone replacement therapy (TRT) has genuine benefits. Growth hormone deficiency is a medical condition that requires treatment. Thyroid disorders are common and manageable with levothyroxine. But the gap between medical necessity and lifestyle optimisation is where most of the risk lives.
The list that follows is not a shopping guide. It is a data‑driven, evidence‑graded checklist — practical for anyone who wants to understand what these substances do, what the actual risks are, and when to leave the needle in the drawer.
A Word on Legality and Ethics
This is not a how‑to guide. This is not a recommendation. The use of any hormone, peptide or steroid without a valid prescription is illegal in most jurisdictions and carries serious risks. Anabolic steroids, SARMs, human growth hormone for non‑medical purposes and most injectable peptides fall into this category. The content that follows is purely informative — so you can recognise what is being sold to you, and make decisions with your eyes open.
The Hierarchy — From Medically Necessary to Marginally Useful to Actively Dangerous
Tier 1 — Medical Necessities (Legitimate Prescriptions Only)
These hormones are genuinely essential for people with diagnosed deficiencies or specific medical conditions. Taking them without a medical need is foolish and potentially harmful.
Testosterone Replacement Therapy (TRT)
Testosterone is the primary male sex hormone. It regulates libido, erectile function, lean body mass, bone density, fat distribution, red blood cell production and mood.
What the data say: In men with low to low‑normal testosterone, aged 40 and above, TRT did not increase all‑cause mortality, cardiovascular mortality, stroke or myocardial infarction, but did increase the incidence of cardiac arrhythmias. TRT consistently improves sexual desire, erectile function, lean body mass, bone mineral density, insulin sensitivity and vitality, with no increased risk of major adverse cardiovascular events or prostate cancer when guidelines are followed.
The main risk: erythrocytosis — a dose‑related increase in red blood cells that thickens the blood and can increase cardiovascular risk — remains the most common adverse effect.
The bottom line: TRT is not a lifestyle optimisation tool. It is a medical treatment for diagnosed hypogonadism. If you have normal testosterone levels, exogenous testosterone will shut down your natural production, cause testicular atrophy and potentially impair fertility — all for little to no benefit.
Thyroid Hormones (Levothyroxine, Liothyronine)
Thyroid hormones regulate metabolism, body temperature, heart rate and growth. Hypothyroidism (underactive thyroid) is common, especially in older adults and women.
What the data say: Levothyroxine‑induced subclinical hyperthyroidism (over‑replacement) may contribute to an increased risk of atrial fibrillation and alterations in bone mineral density. Over‑replacement of hypothyroidism should usually be avoided due to its association with multiple negative health consequences.
The bottom line: If you have hypothyroidism, levothyroxine is essential. But taking thyroid hormone without a deficiency will not make you healthier — it will put you into a hyperthyroid state, causing anxiety, heart palpitations, bone loss and muscle wasting.
Tier 2 — Well‑Supported Supplements with Real Effects
These compounds have reasonable evidence for specific uses, but they are not miracle drugs.
DHEA (Dehydroepiandrosterone)
DHEA is an adrenal androgen that declines with age. It is marketed for anti‑ageing, libido, bone health and cognitive function.
What the data say: A pooled analysis of four RCTs in adults aged 55+ found that daily DHEA supplementation led to significant increases in lumbar spine and femoral neck bone mineral density in women, but not in men, although men did show significant reductions in fat mass. DHEA has anti‑ageing effects via antioxidants, anti‑inflammation, telomere protection and anti‑cortisol mechanisms, and may help prevent atherosclerosis driven by visceral obesity in middle‑aged people. DHEA replacement in elderly men and women improves indices of arterial stiffness, which is an independent risk factor for CVD.
The limitations: Clinical trials have not demonstrated that DHEA supplementation improves cognition in healthy older adults. Routine DHEA supplementation is not supported as an anti‑ageing strategy except in select medical situations. Theoretically, DHEA may cause acne, headache, mood changes, gynaecomastia in men and hirsutism in women, and may lower HDL cholesterol.
The bottom line: DHEA has real effects, but they are modest and not consistent across sexes. Do not expect it to reverse ageing. Use only if you have documented low DHEA‑S levels and under medical supervision.
Melatonin
Melatonin is the sleep hormone. It is widely available over the counter and used for insomnia, jet lag and shift work disorder.
What the data say: Melatonin is considered a safe and well‑tolerated therapeutic agent, particularly for short‑term use. However, concerns regarding adverse effects, including nightmares and grogginess, highlight the importance of careful monitoring. Data on long‑term use (over one year) suggests an association with a 90% greater risk for heart failure compared to non‑users, and long‑term users were 3.5 times more likely to be hospitalised for heart failure and nearly twice as likely to die during the study period.
The bottom line: Melatonin is useful for short‑term sleep disruptions — a few nights of jet lag, a shift work transition. It is not a daily sleep aid. The long‑term safety data are concerning.
Tier 3 — Hormones That Are Mostly Marketing (Weak or No Evidence)
These compounds are heavily marketed but the evidence for their claimed benefits is weak or non‑existent.
GABA
GABA is a neurotransmitter sold as a supplement for anxiety, sleep and stress relief.
What the data say: No serious adverse events have been associated with GABA at intakes up to 18 g/day for four days and in longer studies at 120 mg/day for 12 weeks. Some studies showed small blood pressure changes (less than 10%). Oral supplementation with GABA appears to be fairly safe and well‑tolerated, with no evidence of toxicity in animal studies or serious adverse events in humans.
The problem: The evidence that oral GABA actually crosses the blood‑brain barrier and has meaningful effects in humans is very weak. Most of the claimed benefits are based on animal studies or poor‑quality human trials.
The bottom line: GABA supplements are probably harmless and probably do nothing. Save your money.
DIM (Diindolylmethane)
DIM is a compound derived from cruciferous vegetables, marketed for oestrogen metabolism and hormonal balance.
What the data say: Limited research exists on the safety of DIM, but so far no serious adverse side effects have been found. Most research focuses on people with a history of cancer, so it is unclear whether the safety profile would be different among healthy individuals. Small studies suggest DIM may lead to changes in oestrogen metabolism in premenopausal and postmenopausal women with a history of early‑stage breast cancer.
The bottom line: DIM is not dangerous, but the evidence for any benefit in healthy people is essentially non‑existent. Skip it.
Metformin (as an anti‑ageing drug)
Metformin is a first‑line diabetes medication that has attracted enormous interest as a potential anti‑ageing drug.
What the data say: Metformin retards ageing in model organisms and reduces the incidence of ageing‑related diseases such as neurodegenerative disease and cancer in humans. However, a recent trial in older adults with frailty and probable sarcopenia found that metformin did not improve physical performance, muscle mass or quality of life. The mechanisms by which metformin exerts favourable effects on ageing remain largely unknown. Metformin permanently alters the ability to absorb vitamin B12.
The bottom line: Metformin is a diabetes drug, not an anti‑ageing panacea. Do not take it without a prescription. The evidence for healthy people is weak, and the side effects are real.
Rapamycin (as an anti‑ageing drug)
Rapamycin is an immunosuppressant drug that has been shown to extend lifespan in mice, leading to off‑label use as an anti‑ageing compound.
What the data say: Low‑dose, intermittent rapamycin administration over 48 weeks is relatively safe in healthy, normative‑ageing adults, and was associated with significant improvements in lean tissue mass and pain in women. No serious adverse events attributed to rapamycin were reported in healthy individuals, but there were increased numbers of infections and increases in total cholesterol, LDL cholesterol and triglycerides in individuals with ageing‑related diseases. Trials show that rapamycin extends lifespan in mice, but there is no clear evidence from human studies that it can do the same for healthy adults.
The bottom line: Rapamycin is an experimental drug for anti‑ageing, not a supplement. Do not take it outside of a clinical trial. The human evidence is limited, the long‑term safety is unknown, and the drug is not approved for this indication.
Tier 4 — Prescribed for Specific Medical Conditions (Not for Lifestyle)
These are real drugs with real indications. Using them without a valid medical need is risky and, in many cases, illegal.
hCG (Human Chorionic Gonadotropin)
hCG is a hormone that mimics luteinising hormone (LH) and is used in men to treat hypogonadotropic hypogonadism and in women for fertility treatment.
What the data say: The only FDA‑approved indication for hCG in males is to treat hypogonadotropic hypogonadism and cryptorchidism. It is used off‑label to treat other conditions, including hypogonadism with various aetiologies and infertility. Little has been reported on the adverse side effects of hCG, and there have been no long‑term studies looking at its use for testosterone “replacement”.
The bottom line: hCG is a prescription medicine. Taking it without a medical need is not “biohacking” — it is drug misuse. Do not buy it from underground sources.
Clomiphene (Clomid) / Enclomiphene
Clomiphene is a selective oestrogen receptor modulator (SERM) used off‑label in men to increase testosterone while preserving fertility.
What the data say: Research supports that enclomiphene is as effective as clomiphene for increasing testosterone levels but has a lower rate of documented adverse events. Clomiphene is associated with more side effects, including gynaecomastia and mood swings. High doses of Clomid can have a negative effect on sperm count and motility. Studies on its efficacy in males have had mixed results.
The bottom line: Clomiphene is a drug for female fertility. Its off‑label use in men is unproven in large trials, and the side effects are real. Do not take it without medical supervision.
Anastrozole (Aromatase Inhibitor)
Anastrozole is used in breast cancer treatment to block the conversion of androgens to oestrogen. In men, it is sometimes used off‑label to treat oestrogen‑related side effects of testosterone therapy.
What the data say: Short‑term administration of anastrozole decreases serum oestradiol levels in elderly men with mild hypogonadism, but does not adversely affect bone metabolism over a 12‑week period. However, long‑term therapy may cause decreased bone mineral density due to reduced oestrogen, increasing the risk of osteoporosis. Aromatase inhibition does not improve skeletal health in ageing men with low or low‑normal testosterone levels.
The bottom line: Anastrozole is a potent drug with serious side effects. It is not a “testosterone booster” — it is a cancer chemotherapy agent. Do not touch it without a prescription.
Tier 5 — Very High Risk (Avoid Completely)
These substances carry serious risks of harm, especially when used without medical supervision.
Corticosteroids (Glucocorticoids)
Corticosteroids like prednisone, hydrocortisone and dexamethasone are powerful anti‑inflammatory drugs used for asthma, arthritis, autoimmune diseases and many other conditions.
What the data say: The major side effect of systemic corticosteroids is Cushing’s syndrome, and in the long term, osteoporosis. Other serious side effects include adrenal suppression, hyperglycaemia, dyslipidaemia, cardiovascular disease, psychiatric disturbances and immunosuppression, particularly when used at high doses for prolonged periods.
The bottom line: Corticosteroids are miracle drugs for people with genuine inflammatory diseases. For everyone else, they are a disaster waiting to happen. Do not take them for “recovery” or “immune support.”
Finasteride and Dutasteride (5‑Alpha Reductase Inhibitors)
Finasteride (Propecia, Proscar) and dutasteride (Avodart) block the conversion of testosterone to dihydrotestosterone (DHT) and are used for male pattern baldness and benign prostatic hyperplasia.
What the data say: Sexual side effects, including erectile dysfunction and decreased libido and ejaculate, were reported in as many as 3.4 to 15.8 per cent of men. Post‑finasteride syndrome (PFS) is a phenomenon where side effects like sexual dysfunction and neurological damage persist long‑term after cessation of treatment. Concerns have led the US National Institutes of Health to add a link for post‑finasteride syndrome to its Genetic and Rare Disease Information Center website.
The bottom line: Finasteride and dutasteride are real drugs with real risks. If you take them for hair loss, be aware that for a small but significant minority, the side effects may not go away when you stop. This is not a decision to make lightly.
Peptides (BPC‑157, TB‑500, etc.)
Peptides are short chains of amino acids that are marketed as healing agents, often injected.
What the data say: For BPC‑157, 35 of 36 published studies were conducted in animals, with no published Phase 1 human safety data and no controlled human efficacy trials. As of April 2026, no peptide is FDA‑approved for tendon repair or tendonitis, and a 2025 systematic review confirmed no completed human RCTs for BPC‑157 in orthopaedic sports medicine. The use of wellness peptides is associated with serious risks, including potential for abnormal tissue growth or scar tissue formation and unknown long‑term safety.
The bottom line: Peptides are not medicines. They are experimental compounds sold on the black market. The evidence is almost entirely from animals. You are a human. Do not inject things that have never been tested in humans.
SARMs (Selective Androgen Receptor Modulators)
SARMs are a class of unapproved drugs that mimic the effects of anabolic steroids.
What the data say: The FDA has issued multiple warnings that products containing SARMs are unapproved drugs that have not been reviewed for safety and effectiveness. Life‑threatening reactions, including liver injuries requiring hospitalisation, heart attack, stroke, pulmonary embolism and deep vein thrombosis, have occurred in people taking products containing SARMs. No SARM has received FDA approval, and limited safety and efficacy data have been published.
The bottom line: SARMs are not dietary supplements. They are illegal, unapproved drugs with known life‑threatening side effects. Avoid them completely.
Anabolic Androgenic Steroids (AAS)
AAS are synthetic derivatives of testosterone, used to increase muscle mass and athletic performance.
What the data say: A systematic review and meta‑analysis found that AAS abuse is associated with a range of serious health consequences, including cardiovascular, liver and psychological disorders, as well as infertility. Liver alterations are a prominent concern, with oxidative stress implicated in AAS‑induced hepatotoxicity. Reproductive complications, including gonadal atrophy and infertility, are common, alongside virilisation and feminisation effects in both genders. Cardiovascular effects are particularly worrisome, with AAS implicated in hypertension, dyslipidaemia and increased thrombotic risk.
The bottom line: Anabolic steroids are not performance enhancers in any sustainable sense — they are poisons that temporarily build muscle at the expense of your heart, liver, brain and reproductive system. The mortality data are terrifying. Do not touch them.
The Bottom Line — How to Think About Hormones and Peptides
Here is the honest truth for anyone who has ever wondered whether a little extra testosterone, a healing peptide or an anti‑ageing drug is the answer.
| Tier | Examples | What it means |
|---|---|---|
| Tier 1 — Medical necessities | TRT (for hypogonadism), levothyroxine (for hypothyroidism) | These are legitimate prescriptions. Taking them without a diagnosis is pointless and harmful. |
| Tier 2 — Well‑supported supplements | DHEA, melatonin | Real effects, but modest. Use short‑term or for documented deficiency. Do not expect miracles. |
| Tier 3 — Mostly marketing | GABA, DIM, metformin (off‑label), rapamycin (off‑label) | The evidence is weak or non‑existent for healthy people. Do not waste your money or take unnecessary risks. |
| Tier 4 — Prescribed for medical conditions | hCG, clomiphene, anastrozole | These are real drugs. Do not use them without a valid medical indication and a prescription. |
| Tier 5 — Very high risk | Finasteride, peptides, SARMs, anabolic steroids | Serious side effects are common. Some (SARMs, anabolic steroids) are illegal and life‑threatening. Avoid completely. |
The best hormone optimisation is a whole‑food diet, daily walking, heavy lifting, good sleep, and a life free from chronic stress and alcohol abuse.