01 · FOUNDATIONS
Four Quadrant Health Protocol
Six courses and four quadrant programs covering autoimmunity, metabolism, hormones and cellular health, plus a 30-condition library.
Youthful Academy · Dr. Farhan Tahir, MD
Learn the science of living longer, from a physician you can trust
Evidence-graded courses on the Four Quadrant Health Protocol, longevity therapeutics and peptides, from a quadruple board-certified physician. Plus 10% off everything on Youthful.Shop.
4× Board-certified
Internal, Rheumatology, Integrative, Obesity Medicine
20+ years
Academic, hospital and integrative practice
Evidence-graded
Every therapy labeled by strength of evidence
26 programs
Courses, therapeutics and peptide guides
Inside Youthful Academy
One membership. The whole Youthful Network.
Short, plain-language lessons you can actually use, each one labeled by the strength of the evidence behind it. Youthful Insider members get full access.
02 · THERAPEUTICS
Longevity Therapeutics
Twelve evidence briefs, from exercise and GLP-1s to rapamycin, senolytics and biological age clocks.
03 · PEPTIDES
Peptide Guides
38 peptides graded by tier and evidence across the four quadrants, including the ones we decline.
04 · CLINICIANS
For Physicians
Youthful Talk lectures, clinical cases and the Physician Practice Launch program.
The Four Quadrant Health Protocol
Built on how we practice medicine
Longevity isn't one system. Dr. Tahir's framework connects four of them into one plan.
Quadrant 01
Autoimmunity & Inflammation
RA, lupus, psoriatic arthritis, gout and the inflammation that links them.
Quadrant 02
Metabolic & Obesity Health
Insulin resistance, fatty liver, GLP-1s and protecting muscle.
Quadrant 03
Hormonal Optimization
Thyroid, menopause, testosterone, cortisol and sleep.
Quadrant 04
Regenerative & Cellular Health
Mitochondria, inflammaging, bone, muscle and biological age.
Youthful Insider
Everything we teach, plus member savings.
- All 26 courses, therapeutics briefs and peptide guides
- 10% off every order on Youthful.Shop, applied automatically
- Vetted partner offers and early access to new launches
- New lessons added as the research changes
Meet your instructor
Dr. Farhan Tahir, MD, FACR, Dip. ABOM
“If the research isn't there, we say so.”
Dr. Farhan Tahir is a quadruple board-certified physician in Internal Medicine, Rheumatology, Integrative Medicine and Obesity Medicine, with more than 20 years of clinical experience across academic, hospital, oncology, infusion, telemedicine and integrative settings.
He earned his medical degree at Rawalpindi Medical College, completed his Internal Medicine residency at NYU Downtown Hospital in New York, and trained in Rheumatology at the University of Michigan. It was during that fellowship that his interest in longevity and lifestyle medicine began.
Dr. Tahir is the founder of Youthful Medicine, a concierge longevity and vitality practice in Doylestown, PA and New York, NY, and the creator of the Four Quadrant Health Protocol, a framework that connects autoimmunity and inflammation, metabolic health, hormones, and cellular aging into one plan. At Youthful Academy, he teaches that framework the way he practices it: plainly, and labeled by the strength of the evidence.
Important: education, not medical care
- For education only. Everything in Youthful Insider, including courses, videos, therapeutics briefs and peptide guides, is for personal education and general information.
- No doctor-patient relationship. Becoming a member, purchasing content or contacting us through this site does not establish a doctor-patient relationship with Dr. Farhan Tahir or any Youthful Medicine clinician.
- Talk to your physician first. Do not start, stop or change any medication, supplement, peptide or treatment without the supervision of your own physician.
- Not FDA-evaluated for these uses. Many therapies and peptides discussed are not FDA-approved for the uses described, and evidence labels reflect published research, not a recommendation for you.
- Emergencies. If you think you have a medical emergency, call 911 or your local emergency number.
Start learning at Youthful Academy
Become a Youthful Insider for the full library plus 10% off Youthful.Shop.
Educational content only. Membership does not establish a doctor-patient relationship. Do not make medical decisions without the supervision of your physician. MDNUTRICS PLLC dba Youthful Vitality and Longevity Medicine.