Tools for Male Hormone Optimization: Blood Work, Lifestyle and Smart Supplements
Physician Dr Kyle Gillett joins Andrew Huberman to map out how men can support healthy hormones across a lifetime. He covers the blood markers worth tracking, the lifestyle pillars that move the needle most, and a grounded tour of supplements from creatine and L-carnitine to boron and Tongkat Ali. The recurring theme is working closely with a knowledgeable physician rather than chasing quick fixes.
Overview
This Huberman Lab Essentials episode revisits Dr Kyle Gillett's practical playbook for supporting male hormones across the whole lifespan. He opens with the idea that a person, like a new car, deserves regular diagnostic check-ins, and explains the core blood markers — total testosterone, SHBG and free testosterone — along with the role of DHT.
The foundation, he stresses, is lifestyle: quality diet including foods that help such as dairy and vitamin D, sensible exercise, sleep, stress management and a sense of purpose. He explains why extreme diets and unnecessary caloric restriction can lower free androgens, and why keeping vigorous training under an hour matters. On supplements, he offers a grounded tour of creatine, beta-alanine, betaine and L-carnitine, including how to manage TMAO with garlic, plus vitamin D, boron, Tongkat Ali and Fadogia agrestis for supporting the body's own production.
He then discusses physiologic testosterone therapy dosing and the whole-body monitoring it demands, and touches on clomiphene, alcohol and aromatase, low-dose tadalafil and topical tools for hair. Throughout, the message is measured: track your data, correct real deficiencies, and partner with a skilled physician. This is wellness education, not medical advice.
Key quotes
5When a brand new car comes off the assembly line, you do a full diagnostic workup — and I think we should do the same thing with humans.
For individuals who are not carrying excess body fat, caloric restriction is actually going to lower testosterone.
Hair loss is not a reason to avoid taking creatine. Think of it as just bringing you to what you are naturally inclined to have.
Boron might be one of the reasons the reference range for testosterone is much higher in some countries than in others.
You really have to be a hematologist, dermatologist, cardiologist, a lipidologist — the whole nine yards.
Key ideas
9SHBG and free testosterone
Gillett explains that a useful panel pairs total testosterone with SHBG, or measures free testosterone directly. SHBG is the protein that binds androgens and estrogens, so it shapes how much hormone is actually free to act.
Retest roughly every six months
With no major intervention, he suggests revisiting blood work about every six months using shared decision-making with a physician. The goal is to watch trends over time, not to chase a single number.
Don't cut foods that help
Foods like dairy can support IGF-1, which aids growth and development, while vitamin D supports testosterone and bone. Building bone density before the mid-twenties helps guard against thin bones later.
Extreme diets can cost young men
A balanced mix of animal and plant proteins, fruits, vegetables and starches is a reasonable default. Strict carnivore or vegan diets in the teens and early twenties can significantly lower free androgens.
Caloric restriction and testosterone
Losing genuine excess fat, done gradually, tends to help testosterone. But a deficit in a lean person can lower it, through fewer hormone building blocks, a more catabolic state and higher SHBG.
Why young men rarely need TRT
For a young man whose testosterone and estrogen sit in the normal range, exogenous testosterone carries fertility and other risks and is seldom justified. Gillett notes it is 'almost hardly ever' warranted when very young, outside rare medical cases.
Creatine's many effects
Creatine aids amino acid synthesis, buffers oxidative stress and acts as a backup fuel tank for mitochondria. It slightly raises total testosterone and its conversion to DHT, and does not need to be cycled.
L-carnitine, androgen receptors and TMAO
L-carnitine shuttles nutrients into mitochondria and increases androgen-receptor density, so more testosterone can bind. At high oral doses, watch TMAO, which garlic's allicin and a healthy gut can help reduce.
Botanicals for natural production
Tongkat Ali upregulates several steps in the steroidogenesis cascade and can raise free testosterone, while Fadogia agrestis increases luteinizing hormone. Boron can acutely lower a very high SHBG.
Practical takeaways
6- 1
Track trends with your physician 5:00
Rather than a one-off test, revisit blood work about every six months so you can see how markers move over time and make decisions together with your doctor.
- 2
Keep the foods that are working 7:30
Before removing a food group, consider what it may be doing for you — dairy and vitamin D, for example, can support growth and hormone production during development.
- 3
Feed your gut with fiber 11:30
Think of prebiotic fiber as food for your beneficial gut microbes; it helps set the microbiome's long-term balance. Aim to include it throughout the lifespan.
- 4
Train hard, but keep it short 18:00
Three to four vigorous sessions a week is sustainable, ideally kept under an hour each, with lighter movement added on top. Longer vigorous sessions are not hormonally helpful.
- 5
Pair high-dose L-carnitine with garlic 30:30
If you take L-carnitine at higher doses, allicin from garlic can help reduce conversion to TMAO. Optimizing the gut microbiome helps as well.
- 6
Testosterone therapy needs full monitoring 32:30
If exploring testosterone therapy, work with a physician versed in skin, blood, heart and lipids — or part of a team that is — because there is a lot to watch beyond testosterone itself.
Topics & chapters
15Monitoring hormones for life
Gillett compares a person to a new car that deserves a full diagnostic workup, arguing hormone health should be monitored across the lifespan because development never truly ends.
The blood markers that matter
He explains total testosterone, SHBG and free testosterone, and why DHT — the strongest natural androgen — plays a prominent role in development.
How often to test, and the pillars
Retesting roughly every six months with a physician, and the foundational lifestyle pillars: diet, exercise and sleep.
Dairy, IGF-1, vitamin D and bone
Why not to cut foods that help, how IGF-1 supports growth, and the value of building bone density before the mid-twenties.
Diet quality and extreme diets
A balanced mix of animal and plant foods, and why strict carnivore or vegan diets can lower free androgens in the teens and early twenties.
Fiber, the gut and fatty acids
Prebiotic fiber sets the gut microbiome's lifelong set point, and essential fatty acids support brain development throughout life.
Caloric restriction and testosterone
Losing excess fat can help, but a deficit in a lean person can lower testosterone through fewer building blocks and higher SHBG.
Stress and purpose
Managing stress and finding a sense of purpose — the self-actualization tier of Maslow's hierarchy — as often-overlooked hormone pillars.
A sustainable exercise regimen
Three to four vigorous sessions a week, kept under an hour, with lighter movement added on top.
Why young men rarely need TRT
Taking exogenous testosterone with normal levels carries fertility and other risks and is seldom justified in the teens, twenties or thirties.
Creatine, beta-alanine and betaine
Creatine's many effects, the hair-loss myth, and options such as betaine and beta-alanine for non-responders.
L-carnitine, TMAO and garlic
Forms and dosing of L-carnitine, its effect on androgen receptors, and managing TMAO with allicin from garlic.
Vitamin D, boron and botanicals
Correcting vitamin D deficiency, lowering a high SHBG with boron, and Tongkat Ali and Fadogia agrestis for natural production.
Testosterone therapy and monitoring
Physiologic dosing spread across the week, and the whole-body monitoring that testosterone therapy demands.
Clomiphene, alcohol, tadalafil and hair
The trade-offs of SERMs, alcohol and aromatase, low-dose tadalafil for prostate and blood flow, and topical options for hair.