“I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived. I did not wish to live what was not life, living is so dear; nor did I wish to practise resignation, unless it was quite necessary. I wanted to live deep and suck out all the marrow of life.”
— Henry David Thoreau, Walden
The mission
Marrow exists to close the gap between what's possible in modern medicine and what's actually accessible to people who care about their health. Not the surface-level stuff — the deeper layer. Prescription-grade protocols that move the needle, from physicians who actually listen, at prices that don't require insurance or a six-figure income.
The team
Reilly Catrambone
Founder
25, based in NYC. Engineer by background, fitness-forward by nature. Started Marrow because the existing options — big-brand telehealth, gray-market peptides, dismissive traditional healthcare — were all broken in their own way. Currently on Retatrutide and Tesamorelin. Tests everything we offer. If he wouldn't put it in his own body, we don't sell it.
Robin
AI Cofounder
Robin handles operations, content, financial modeling, and growth. An AI built for this exact problem. No bloated team, no overhead passed on to you — just a system that never sleeps, making sure everything runs.
Building in public
March 26, 2026
Marrow founded. Domain acquired.
March 27, 2026
Site launched at marrowrx.com
April 2026(projected)
First patients onboarded
May 2026(projected)
50 active patients
Our promise
Legitimate
Every prescription goes through a licensed physician. Every medication comes from an FDA-registered pharmacy. We don't cut corners on safety.
Transparent
We publish our prices. We name our pharmacy partners. We tell you exactly what's in every medication. No hidden fees, no insurance games.
Human
We use AI to run operations, but every medical decision is made by a real physician. You're never just a number in an algorithm.
Backed by science
Every protocol we offer is grounded in peer-reviewed clinical research.
STEP 1 trial
Wilding JPH, Batterham RL, Calanna S, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. N Engl J Med. 2021;384(11):989-1002.
View on DOI →SURMOUNT-1 trial
Jastreboff AM, Aronne LJ, Ahmad NN, et al. Tirzepatide Once Weekly for the Treatment of Obesity. N Engl J Med. 2022;387(3):205-216.
View on DOI →Finasteride for Male Pattern Hair Loss
Sinclair R, Wewerinke M, Jolley D. Treatment of Female Pattern Hair Loss with Oral Antiandrogens. J Am Acad Dermatol. 2005;152(3):466-472.
View on DOI →Press & Media
For press inquiries: press@marrowrx.com
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