For Research Purposes Only — Not intended for human consumption or therapeutic use
Born from a Woman's
Understanding
Rejuven was founded by women who know women's bodies — because we've lived in them, studied them, and spent over 30 years learning how to help them thrive.
30+
Years in Anti-Aging
12K+
Women Served
98%
Peptide Purity
100%
Women-Founded
Dr. Isabella Harmon
Co-Founder & Chief Science Officer
We Built the Brand
We Needed Ourselves
It started with frustration. Our founder, Dr. Isabella Harmon — a board-certified anti-aging physician and endocrinology researcher with over 30 years of clinical experience — watched women in her practice being dismissed, underserved, and handed generic weight loss advice that didn't account for their biology.
Women's bodies are profoundly different from men's. Hormonal fluctuations across the menstrual cycle, perimenopause, and menopause create metabolic shifts, skin changes, and weight challenges that no one-size-fits-all supplement line addresses. She knew this because she'd lived it. Her team of all-women researchers, formulators, and wellness coaches had lived it too.
So in 2019, Dr. Harmon and co-founder Dr. Renée Castellanos — a peptide biochemist and skincare formulation expert — launched Rejuven with one purpose: to give every woman access to the same clinical-grade, science-backed solutions that were previously only available to elite patients at private anti-aging clinics.
Women-Led Science
100% women-founded and led research team
Female Biology First
Every formula designed around women's hormonal cycles
30+ Years Research
Decades of anti-aging and endocrinology expertise
Uncompromising Quality
≥98% purity, third-party verified peptides
We Know Women's Bodies
Because We Study Them Every Day
Over three decades, our team has amassed clinical knowledge that goes far beyond general wellness — we specialize specifically in what happens to women's bodies as they age, shift hormonally, and seek transformation.
Anti-Aging Mastery
30+ yrsOver 30 years developing, testing, and refining anti-aging protocols specifically for women's skin biology — from collagen stimulation to hormonal skin changes during menopause.
Women's Weight Science
12K+ womenWe understand why women gain weight differently than men — and why they lose it differently too. Our protocols address hormonal weight gain, metabolic slowdown, and sustainable fat loss.
Peptide Biochemistry
98%+ purityOur in-house peptide biochemist Dr. Castellanos has over 20 years of experience formulating clinical-grade peptides optimized for female physiology and bioavailability.
"Every woman deserves to feel as radiant, energized, and confident as science can make possible."
— Dr. Isabella Harmon, Co-Founder & CEO, Rejuven
Our Core Values
Women First, Always
Every product, every protocol, every decision starts with one question: what's best for women's bodies? Not men's data adapted for women — women's actual biology.
Science Without Compromise
We don't sell hope in a bottle. We sell what works — backed by peer-reviewed research, third-party purity testing, and three decades of clinical experience.
Transparent & Honest
We share what's in our products, how they work, and what to realistically expect. No overpromising. No magic claims. Just honest wellness science.
Lasting Transformation
We're not interested in quick fixes. We help women build sustainable wellness foundations — weight management, skin health, and vitality that endures.
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Premium quality, designed for women, backed by 30 years of science. Explore our full range of clinical-grade peptides and skincare solutions.
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