Is MedisourceRx legit?

What MedisourceRx is

Nivagen Pharmaceuticals announced on Sep 23, 2024 that it sold its MedisourceRx business unit, "an FDA registered 503B outsourcing facility," to Hims & Hers ^[2]. FDA lists MedisourceRx at Los Alamitos, CA ^[1], and its 2025 Form 483 gives 10525 Humbolt St ^[6].

Hims & Hers' 10-K for 2025 says its facilities include "a licensed 503B compounding outsourcing facility," that it "may also offer access to drugs compounded by facilities referred to as 503B outsourcing facilities, including MedisourceRx," and that it currently uses only 503A pharmacies for compounded GLP-1 products ^[5].

503B registration

FDA's registered outsourcing facility list, checked Oct 24, 2026, shows MedisourceRx with a most recent registration of Jan 2, 2026, a last inspection of Jun 10, 2025, a Form 483 issued, and intent to compound sterile drugs from bulk ^[1]. FDA says registration is not approval of the facility or its drugs ^[7].

FDA record

FDA actions on record for MedisourceRx since the Hims purchase, checked Oct 24, 2026

Date	Action	Details
May 27 to Jun 10, 2025	Inspection, Form 483 with 2 observations	An adverse event report not filed within 15 days ("severe GI issues" and a three-night hospital stay after a semaglutide injection), and pests in production areas, including a live spider in the production area where semaglutide ingredient is kept in refrigerators [6]
Dec 12, 2025	Warning letter	FDA said its products "failed to meet the conditions of section 503B," citing the missing adverse event report and unclear reporting procedures [3]
Jul 27, 2026	Closeout letter	FDA said MedisourceRx appears to have "adequately addressed the violations" [4]
Any date	Recalls	None found in openFDA recall data for "MedisourceRx" [8]

Which providers we review use it

MedisourceRx is tied to Hims & Hers ^{[2] [5]}. We rate Hims weight loss and Hers weight loss Avoid, and we review Hims testosterone and Hers menopause too. Hims also received an FDA warning letter on Sep 9, 2025 ^[9]; see our FDA warning letter tracker. Biote owns a 503B facility in the same way; see Asteria Health.

What it means for a Hims or Hers patient

Medicine made by MedisourceRx is a compounded drug, and compounded drugs are not FDA-approved ^[10]. FDA does not review them for safety, effectiveness or quality before they reach patients. Our pages on compounded semaglutide and compounded tirzepatide explain the legal limits.

1. Read the label. The pharmacy name and address on the vial or box should match a pharmacy you can look up. FDA lists a pharmacy name on the label that you think might be fraudulent as a red flag ^[11].
2. Check the license with the state board. For a 503B facility, check FDA's registered outsourcing facility list first ^[1]. FDA's BeSafeRx page links every state board of pharmacy license search ^[12]. Check your own state too.
3. Check the website with NABP. The National Association of Boards of Pharmacy runs a Safe Site Search on Safe.Pharmacy and says a safe online pharmacy accepts only valid prescriptions, is licensed where it is located and where you live, and has a pharmacist you can reach ^[13].
4. Never buy research-use-only vials. They are not legal for human use and are not pharmacy products.
5. Report problems. FDA asks people to report side effects or quality problems with any medicine to MedWatch ^[11]. For a medical emergency, call 911.

Other pharmacies are on all the pharmacies we checked.