The Journal
The journal of Longevity Marbella, the private practice of Dr Francis de Windt, double board certified in Internal Medicine and Endocrinology, on the Costa del Sol. Every article is written by him and sourced to the study it comes from.
Not sure where to start?
Three steps, in the order a specialist takes them. About ten minutes in total, and you can stop after any of them.
For women: not sure where to start?
The same three steps, starting from your symptoms, not his. About ten minutes in total, and you can stop after any of them.
Told Everything Was Fine?
Nobody Measured Everything.
Four steps, in the order a specialist takes them. Jump in anywhere. Every article is free.
Message the endocrinologistThree things almost nobody measures. All of them measurable in one visit. The Body Composition Assessment
Drive, energy, muscle. Gone.
And the weight sits on the middle no matter how you train.
“Everything looked fine.”
A single testosterone value, read in isolation, is not a diagnosis. You were sent home with it anyway.
It is not only how you feel.
Low testosterone travels with heart risk, diabetes, joint pain and fertility.
Who reads it decides everything.
Influencers, and clinics where no hormone specialist reads your results, at best a GP. Confidence is not accountability.
Is Testosterone Therapy Safe?
What the largest trial to date (5,200+ men) found about TRT, the heart, and the prostate.
Free Testosterone vs Total Testosterone
In 557 men, free testosterone tracked muscle mass, grip strength and leg power in older men. Total testosterone largely did not. Why a normal result can still miss the problem.
GP vs Endocrinologist for TRT
Anyone can prescribe testosterone. Getting the best result safely, and protecting your fertility, is a specialist's job.
HRT for Menopause: How Safe and Effective Is It?
What the evidence says about your symptoms, heart, bones, and breast cancer risk, and why timing matters so much.
The Bone Window: What Menopause Takes Before You Notice
The fastest bone loss of your life happens before anyone offers you a scan.
What Menopause Does to Muscle and Visceral Fat
The weight barely changes. The shape does, and so does the metabolism underneath it.
Retatrutide vs Mounjaro vs Wegovy
The next generation of weight-loss medicine, what the head-to-head data show, and why pharmacy-grade beats the underground market.
What GLP-1 Weight Loss Does to Your Testosterone
Losing fat can bring your testosterone back. The same drugs also strip muscle. Almost nobody is managing both sides at once.
GLP-1 Weight Loss and Muscle Loss: What the Evidence Shows
Does Mounjaro or Wegovy make you lose muscle, not just fat? The real meta-analysis numbers, and what actually protects your muscle.
Peptides for Recovery & Performance: An Honest Guide
BPC-157, TB-500, GHK-Cu, CJC-1295, ipamorelin, MOTS-C, follistatin and more. What each does, what the evidence shows, and which are approved or banned.
BPC-157 for Injury Recovery: What the Evidence Shows
How it works, the encouraging animal and early human data, and the FDA's 2026 review for legal compounding. A balanced look at the peptide everyone is asking about.
CJC-1295 and Ipamorelin: What the Evidence Shows
Two growth-hormone peptides, always stacked. They raise GH on paper, but human recovery benefits are unproven, with real concerns.
How to Improve Male Fertility
A large review of 28 treatments shows what genuinely improves sperm quality.
Does TRT Cause Infertility? What Really Happens, and How to Protect It
Yes, testosterone therapy usually lowers your own sperm production, but there are protocols designed with fertility in mind. Here's how, in plain English.
Fitness and Longevity: What VO2max Predicts
What a study of 122,000 people found about fitness and mortality risk. Why cardiorespiratory fitness (VO2max) is one of the strongest, and most changeable, predictors of a long life.
Does Coffee Affect Your Testosterone?
Higher coffee drinkers had less body fat, more muscle, higher total testosterone and lower free testosterone. Why that is not a contradiction.
Muscle Is a Survival Organ
In 6,891 critically ill patients, low muscle mass more than doubled the odds of death. Why muscle matters for longevity, and what to do about it.
Is Creatine Safe?
One of the most studied supplements on earth. For healthy adults at recommended doses the evidence says yes, and most feared side effects are myths.
Creatine, the Brain, and Healthy Aging
Beyond the gym, creatine supports the brain's energy supply, may help thinking under stress or sleep loss, and helps older adults hold on to muscle.
Does Creatine Cause Hair Loss?
There is no good evidence creatine causes baldness. The whole fear traces to one 2009 study that measured a hormone, not hair, and was never replicated.
Anabolic Steroids: The Real Health Effects, and What Recovery Looks Like
Millions of men have used anabolic steroids, and most never see a doctor about it. The honest evidence on what they do to your body, and what coming back from it actually looks like.
What Anabolic Steroids Do to the Heart, and What Stopping Changes
Imaging found reduced pumping and relaxation and more coronary plaque, with a clear dose response. Men who had stopped measured better than men still using.