Last reviewed: June 25, 2026
Last updated: June 25, 2026
Written by:
Jay Hastings,
CEO of PlexusDx
Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance.
Medically reviewed by:
Jayden Lee, PharmD, EMBA
Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.
This article is part of the PlexusDx Education Hub — science-backed guidance on GLP-1 medications, metabolic health, and precision weight management.
Weight loss medications and hormone replacement therapies target different body systems, but they can influence each other in meaningful ways. If you're considering both GLP-1 treatment and testosterone therapy, knowing how they work together—and whether they're compatible—matters for your health outcomes and treatment success.
How GLP-1 Medications Affect Hormone Levels
GLP-1 receptor agonists like semaglutide work by activating receptors in your brain and pancreas to reduce hunger and improve blood sugar control. Beyond appetite suppression, these medications influence hormonal signaling throughout your body, including pathways that connect to testosterone production and sensitivity. Research shows that weight loss itself—often substantial with GLP-1 therapy—can naturally restore testosterone levels in men who were previously overweight or obese.
Semaglutide does not directly suppress testosterone production in clinical trials. However, the medication's effects on metabolism, insulin sensitivity, and fat loss can indirectly influence how your body produces and uses hormones. Men using compounded semaglutide injections have reported improvements in energy, libido, and mood alongside weight loss, suggesting hormonal benefits rather than interference.
Combining Testosterone Replacement with GLP-1 Therapy
Testosterone replacement therapy (TRT) and GLP-1 medications address separate physiological needs and do not have a documented contraindication. Both can be used concurrently when prescribed under medical supervision, as neither directly blocks the other's mechanism of action. Your prescribing provider should review both treatments to ensure they complement your overall health goals—particularly your weight loss trajectory and hormonal baseline.
Patients on both therapies often experience synergistic metabolic improvements: testosterone supports muscle preservation and strength during weight loss, while GLP-1 medications accelerate fat loss and improve cardiometabolic markers. The key is monitoring how the combination affects your energy levels, appetite regulation, and secondary sexual function to ensure optimal dosing for each treatment.
Monitoring Hormonal Changes During GLP-1 Treatment
Starting GLP-1 therapy typically requires baseline and follow-up labs to assess weight loss, blood sugar control, and metabolic health. If you're also on testosterone replacement, your healthcare provider may recommend periodic testosterone level checks to confirm that your TRT dose remains appropriate as your body composition and metabolism change. Weight loss can increase testosterone sensitivity, potentially requiring dose adjustments in your replacement therapy.
PlexusDx patients who opt for the Precision Peptide Genetic Test receive insights into how their genetic variants in peptide pathways—including GLP1R rs6923761, FTO rs9939609, and MC4R rs17782313—influence their metabolic response. This personalized data helps providers understand your individual hormonal sensitivity and weight loss patterns, enabling more precise dosing strategies for both GLP-1 medications and any concurrent hormone therapies.
Choosing Between Semaglutide and Other GLP-1 Options
PlexusDx offers compounded semaglutide injections starting at $149 per month through licensed 503A compounding pharmacies, making effective GLP-1 therapy accessible without insurance requirements or membership fees. Semaglutide is well-suited for patients combining weight loss with hormone replacement because it has the longest clinical safety record and minimal interactions with other medications. Your dose may need to go up as your body responds to treatment—your price won't, ensuring predictable monthly costs regardless of therapy intensity.
For patients seeking flexibility, PlexusDx also provides oral semaglutide and dual-compound options like GLP-Squared Injection (combining semaglutide and tirzepatide). Each option works with testosterone replacement equally well, and all are HSA/FSA eligible. A consultation with PlexusDx healthcare providers can help determine which formulation best fits your hormone-balancing goals and lifestyle.
Managing Side Effects When Combining Therapies
GLP-1 medications sometimes cause nausea, constipation, or changes in appetite perception during the first few weeks—effects that are independent of testosterone therapy. Testosterone replacement may increase energy and confidence, which can help offset appetite suppression side effects and support consistent exercise adherence. Most patients experience fewer gastrointestinal issues after 4–6 weeks as their bodies adapt to semaglutide dosing.
If you experience unexpected hormonal symptoms—such as mood changes, sexual dysfunction, or sleep disruption—after starting GLP-1 treatment alongside TRT, inform your prescriber promptly. Adjusting timing of doses, hydration, or meal composition can often resolve mild side effects without stopping either therapy. PlexusDx's support team and licensed providers are available to discuss side effect management and personalize your treatment plan.
How Your Genetics Influence GLP-1 Response
Not everyone responds to GLP-1 medications the same way. Genetic variants — including GIPR rs1800437, GLP1R rs6923761, FTO rs9939609, and MC4R rs17782313 — influence how your body processes these medications, how much weight you lose, and how you tolerate side effects. PlexusDx maps 14 pathways, 49 peptides, and 150+ genetic insights to match each patient to the right medication, dose, and lifestyle protocol for their biology. The PlexusDx Precision Peptide Genetic Test ($99 add-on after your first month of treatment) gives your provider precise insight into your peptide genetic predispositions before the first prescription is written.
Access Personalized GLP-1 Care Through PlexusDx
PlexusDx offers six prescription GLP-1 protocols to all 50 states — no membership, no insurance required, async intake or live consult. The Semaglutide Injection starts at $149/mo. Medications are dispensed from licensed 503A compounding pharmacies following strict quality and safety standards. Add a Precision Peptide Genetic Test for $99 to personalize your protocol from day one.
Frequently Asked Questions
Is it safe to take semaglutide while on testosterone replacement therapy?
Yes, GLP-1 medications and testosterone replacement have no direct contraindication and are frequently used together. Both therapies target different body systems and do not block each other's action. Your healthcare provider should monitor your response to ensure doses remain appropriate as your body composition changes.
Will GLP-1 medication lower my testosterone levels?
Clinical evidence shows that semaglutide and other GLP-1 agonists do not directly suppress testosterone production. However, significant weight loss—which these medications facilitate—can naturally improve testosterone levels in men who were previously overweight, potentially reducing your need for replacement therapy over time.
Can I start PlexusDx semaglutide while already taking testosterone?
Yes. PlexusDx compounded semaglutide injections can be started while you're on existing testosterone therapy. Inform your prescriber about all medications and supplements you're taking, and plan for follow-up labs to monitor your metabolic response and hormonal balance during treatment.
How much does compounded semaglutide cost at PlexusDx?
PlexusDx semaglutide injections start at $149 per month through licensed 503A compounding pharmacies, with no insurance required and HSA/FSA eligibility. Your dose may increase over time based on your weight loss response—but your monthly price remains flat, never rising with dose adjustments.
What is the Precision Peptide Genetic Test and how does it help with hormone balance?
PlexusDx's Precision Peptide Genetic Test ($99 add-on after your first month) analyzes 14 pathways and 150+ genetic insights, including variants in GLP1R, FTO, and MC4R genes that influence your metabolic and hormonal response to weight loss. This data helps providers optimize your GLP-1 dose and understand how your genetics interact with testosterone therapy.
Related Reading
Pricing and availability current as of June 2026. Compounded GLP-1 medications are not FDA-approved drug products; they are prepared by licensed compounding pharmacies under federal compounding regulations. Compounded semaglutide and tirzepatide are not the same as Wegovy, Ozempic, Zepbound, or Mounjaro. This article is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting, stopping, or changing any medication.
Return to the PlexusDx Education Hub for more evidence-based resources on GLP-1 therapy, metabolic health, and personalized weight management.
Medical and Editorial Standards
Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.
Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance.
Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.
Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.
Share:
Optimizing Your Nutrition: What Foods Should I Eat While on Wegovy?
Where to Put the Ozempic Shot: A Guide to Injection Sites