FDA Warning Letter Calls Empower Pharmacy's Vitamin-Added GLP-1 Compounds 'Essentially Copies'

On 18 September 2026, the FDA issued a warning letter to Empower Clinic Services, LLC, doing business as Empower Pharmacy in Houston, stating that its tirzepatide-niacinamide and semaglutide-cyanocobalamin (vitamin B12) products "appear to be essentially copies" of FDA-approved drugs, and that the volume produced suggests the differences are "pretextual."

The letter, number 738238, was signed by Clint L. Narver, director of the Office of Compounding Quality and Compliance in the FDA's Center for Drug Evaluation and Research. It follows an inspection of the Houston facility from 3 to 14 November 2025. The agency's web page for the letter shows it as current as of 22 September 2026.

The letter is addressed to Empower's founder and chief executive officer and was sent by electronic mail. It says the FDA issued a Form FDA 483 on 14 November 2025 and received Empower's responses dated 8 December 2025, 18 March 2026 and 30 April 2026.

The products named in the letter pair a GLP-1 ingredient with a vitamin. That is the same kind of combination the FDA used as its own worked example of an "essentially a copy" product in its April 2026 compounding statement, discussed below.

What the FDA says it found in these compounded GLP-1 products

The letter is addressed to a pharmacy compounding under section 503A of the Federal Food, Drug, and Cosmetic Act. That route covers state-licensed pharmacies filling prescriptions for individually identified patients. It is separate from 503B outsourcing facilities. One condition of 503A is that a pharmacy must not compound "regularly or in inordinate amounts" drugs that are essentially copies of a commercially available product. A copy is exempt only when a prescriber decides that a change produces a "significant difference" for an identified individual patient.

The FDA names three products:

• Tirzepatide/niacinamide, 4 mL, 17/2 mg/mL
• Semaglutide/cyanocobalamin, 1 mL, 5/0.5 mg/mL
• Tirzepatide/niacinamide, 2.5 mL, 8/2 mg/mL

The letter says Empower compounded and filled orders for each product every month from July through October 2025. The FDA redacted the quantities. The letter states: "The volume of products you are producing suggests that differences between products you are compounding and the FDA-approved products are pretextual."

The agency describes three kinds of evidence:

• prescriptions with no prescriber determination of significant difference;
• "significant difference" statements that "appear to be repeated verbatim across many records," which the FDA says suggests they "may be pre-generated for selection by the prescriber";
• the volume of the products themselves.

The letter adds that "third-party technology platforms that provide prescribers with pre-selected menu options" for a significant-difference statement call the individual nature of those decisions into question.

On that basis, the FDA concludes that the products do not qualify for the 503A exemptions. It calls them "ineligible drug products" and says they are unapproved new drugs, misbranded because their labelling lacks adequate directions for use, and subject to current good manufacturing practice (CGMP) rules.

Sterile-production findings

The letter also cites insanitary conditions, which the FDA says apply "regardless of whether" a product meets 503A. Its examples include inadequate smoke studies to show one-way airflow in the ISO 5 area and media fills that "were not performed under the most challenging or stressful conditions." It lists five CGMP violations, including failures to monitor environmental conditions in aseptic processing areas and to validate aseptic and sterilization processes. The FDA says some of Empower's responses to the November 2025 Form FDA 483 "appear adequate." It calls others deficient: for media fills, it says the summary report "does not appear to match" the number of vials inspected in the underlying records.

On airflow, the letter says Empower's response described a smoke study under "Rev. 005" run from 30 March to 3 April 2026, but that the study had not been finalized or provided to the FDA. Empower's response said the study "remains in controlled post-execution review." On the January 2026 media fill, the FDA says multiple records were transcribed onto "Form Revision 3" because the original results were documented on the wrong form. "Without a clear audit trail showing why results were rewritten and who authorized it," the letter says, "this practice raises concerns about whether the data accurately reflects what actually occurred during the media fill."

The FDA asked for a written response within 15 working days. It warned that failing to address the violations "may result in legal action without further notice, including, without limitation, seizure and injunction."

What a Form 483 and a warning letter are

A Form FDA 483 is the list of observations investigators give a firm's management at the end of an inspection. The FDA says it is issued when investigators have observed conditions that "in their judgment may constitute violations," and that it "does not constitute a final Agency determination."

A warning letter is the next step. The FDA's Regulatory Procedures Manual says warning letters are issued "only for violations of regulatory significance," defined as violations "that may lead to enforcement action if not promptly and adequately corrected." It also says a warning letter "is informal and advisory" and that the FDA does not consider one "to be final agency action on which it can be sued."

If a response appears adequate, the FDA verifies the corrections. The manual says: "Usually, the standard for verifying that corrections have been implemented will be a follow-up inspection." The agency may then issue a close-out letter, but not "based on representations that some action will or has been taken." As of 28 September 2026, the FDA's page for letter 738238 shows no posted response and no close-out letter.

The compounded GLP-1 policy behind the letter

On 1 April 2026, the FDA updated its GLP-1 compounding statement. It said it may consider a semaglutide-plus-vitamin B12 compound to be essentially a copy when it is given by the same route as the approved products and each ingredient is within 10% of the strength of its approved counterpart. The same statement says the FDA does not currently intend to act when a compounder fills four or fewer prescriptions of such a product in a calendar month.

The statement sets out the general 503A test behind that example. The FDA says it intends to consider a compounded drug essentially a copy when it has the same active ingredient as a commercially available drug "in the same, similar or an easily substitutable strength" and the approved drug can be used by the same route "regardless of how it is labeled." The exception is when a prescriber "determines and documents" a significant difference for an identified individual patient.

A footnote in the Empower letter repeats that the FDA's enforcement discretion for 503A compounding of copies of these drugs ended on 5 March 2025 for tirzepatide injection products and on 24 April 2025 for semaglutide injection products. The April statement also says neither substance currently appears on FDA's drug shortage list or the 503B Bulks List.

For 503B outsourcing facilities, the statement sets different conditions. They may not compound from a bulk drug substance unless it appears on "a list identifying bulk drug substances for which there is a clinical need," the 503B Bulks List, or the drug is on FDA's drug shortage list "at the time of compounding, distribution and dispensing." Shortage-related enforcement discretion for outsourcing facilities ran later than for pharmacies: until 19 March 2025 for tirzepatide and 22 May 2025 for semaglutide injection products.

What this does not say

• It is not a final enforcement action. A warning letter states the FDA's position and invites a response. The FDA says it is "not intended to be an all-inclusive statement of violations." Empower may dispute the findings. No court has ruled on them.
• It does not ban compounded GLP-1s. It applies the "essentially a copy" test to specific products at one pharmacy. It does not reach every 503A pharmacy or every combination product.
• It says nothing about how well the products work. The letter makes no clinical findings on these compounds. Compounded drugs are not FDA-approved, and the FDA has not evaluated them the way it evaluates approved products.
• It is not the 503B Bulks List decision. The bulks-list proposal concerns outsourcing facilities and is a separate proceeding. As of 28 September 2026, the Federal Register's FDA listings show no final notice since the 26 June 2026 comment-period extension.

This article reports regulatory actions. It is not medical advice. Questions about a specific prescription belong with a licensed clinician or pharmacist.

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