Health Education Articles | PlexusDx

Gym-goer representing the genetics behind why muscle building response varies — PlexusDx Precision Peptide Genetic Test

Why Don't I Build Muscle? Your Genetics May Have Answers

Struggling to build muscle despite consistent training? Genetics may be the missing variable. MSTN, ACTN3, IGF1, GHSR, and VDR variants all influence how your body responds to resistance training stimulus — from hypertrophy ceiling to anabolic signal strength to fiber architecture. The Precision Peptide Genetic Test analyzes 15 Muscle Growth insights across 14 pathways, 49 peptides, and 150+ genetic insights.

Keep in Touch

Subscribe to our newsletter and stay up-to-date on new reports, tests, and health tips designed to help you live your healthiest life.

Important information about your prescription program.

PlexusDx is not a medical practice or pharmacy. Using this website does not create a doctor-patient relationship between you and PlexusDx.

Clinical services are provided by an independent network of U.S.-licensed clinicians through a state-licensed telehealth platform. Compounded medications are dispensed by state-licensed compounding pharmacies operating in FDA-registered facilities. Compounded medications are not FDA-approved and have not been evaluated by the FDA for safety, efficacy, or quality.

If you would prefer a branded, FDA-approved prescription medication, your provider may write a prescription that you can fill at the pharmacy of your choice. PlexusDx does not sell or ship branded prescription medications.

Medication and clinical service fees are billed and collected by the practice-management platform that supports the prescribing clinicians. PlexusDx is paid separately for the data, referral, and customer-experience services that PlexusDx provides. PlexusDx is not the merchant of record for any prescription medication.

The Precision Peptide Genetic Test and any other genetic test or report sold by PlexusDx is intended to provide personalized educational information about your biology. It does not recommend, prescribe, or determine which medications a customer should use. Treatment decisions are made by your independent prescribing clinician based on your full medical history.

Product images on this site are illustrative and may not represent actual product packaging.

Individual results vary. Statements regarding outcomes are not guarantees and have not been evaluated by the FDA.

All content on this site is for educational purposes only and is not a substitute for medical advice, diagnosis, or treatment. Always seek the advice of a qualified clinician with any questions you may have about a medical condition or treatment.

Ozempic®, Wegovy®, Rybelsus®, Zepbound®, and Mounjaro® are registered trademarks of their respective owners and are not affiliated with PlexusDx.

learn