March 2026
Compounding Pharmacy Quality Standards and Ingredient Verification
Every active pharmaceutical ingredient (API) used in a compounded medication must be reviewed for legal eligibility, supplier legitimacy, and pharmaceutical documentation before it is used in a prescription preparation.
1. Federal Law Determines Which Ingredients Can Be Used in Compounding
Before an ingredient can be considered for use in a compounded medication, pharmacists must confirm that it is legally eligible for pharmacy compounding. Under federal law, active pharmaceutical ingredients must meet at least one of the following criteria:
- Have a United States Pharmacopeia (USP) or National Formulary (NF) monograph
- Be a component of an FDA-approved drug
- Appear on an FDA bulk drug substances list permitted for compounding
If a substance does not meet one of these criteria, it cannot be used in a compounded medication regardless of demand or availability.
This legal gatekeeping step alone excludes large categories of substances that have recently been raised in legislative and regulatory discussions, including “research grade” chemicals and unapproved peptide products.
2. Pharmacies Validate the Legitimacy of API Suppliers
Once the pharmacist determines an API is legally eligible, they must validate the supplier, not just the substance. Federal law and best practice require pharmacies to confirm that API suppliers are:
- FDA-registered manufacturers, or
- State-licensed wholesalers sourcing from FDA-registered manufacturers
Pharmacies verify supplier credentials using regulatory resources such as:
- FDA registration databases
- State licensing databases
- National Association of Boards of Pharmacy (NABP) verification tools
Pharmacies verify supplier credentials through FDA registration databases, state license lookups, and National Association of Boards of Pharmacy resources. The pharmacy must maintain vendor files to document licensing status, inspection history, and enforcement actions when applicable
State-licensed compounding pharmacies are prohibited from purchasing API from:
- Online chemical marketplaces
- “Research use only” chemical suppliers
- Unlicensed domestic or overseas vendors
3. Certificates of Analysis Are Reviewed for Each Ingredient
Active pharmaceutical ingredients supplied to compounding pharmacies are accompanied by a Certificate of Analysis (COA).
The COA documents key attributes such as:
- Ingredient identity
- Purity specifications
- Potency testing results
- Batch and lot information
Pharmacists review these documents to confirm the ingredient meets documented specifications before it is accepted into inventory. Typical verification includes reviewing:
- Lot numbers and traceability
- Testing methods used by the manufacturer
- Identity and purity specifications
- Consistency within the documentation
Ingredients with incomplete or inconsistent documentation are not accepted.
4. Independent Laboratory Testing May Be Used for Additional Verification
When pharmacies source API from a new or unfamiliar supplier, the Alliance for Pharmacy Compounding strongly recommends having independent third-party laboratory testing of the API before it is used in a compounded preparation.
This testing may include:
- Identity confirmation
- Potency verification
- Purity testing
- Water content or impurity analysis, as appropriate
Third-party testing serves as a check on both the manufacturer and the wholesaler and is widely used for higher-risk APIs, shortage drugs, or products subject to increased scrutiny by regulators.
5. Monitoring for Counterfeit or Illegitimate Ingredients
Compounding pharmacies monitor the pharmaceutical supply chain for signs that an ingredient may not be legitimate.
Examples of warning signs may include:
- Unusually low pricing
- Inconsistent packaging or labeling
- Missing lot numbers or documentation
- Vendors unable to provide licensing records
If concerns arise, the ingredient may be quarantined and reviewed before it is used in a compounded medication.
6. Sterile Compounded Medications Require Additional Testing
Sterile compounding involves additional standards beyond ingredient verification.
USP sterile compounding standards require pharmacies to implement procedures such as:
- Sterility testing (USP <71>)
- Bacterial endotoxin testing (USP <85>) when applicable
- Environmental monitoring of sterile compounding areas
- Validation of aseptic compounding procedures
These requirements apply to sterile preparations such as injectable medications and ophthalmic drops.
Examples of sterile compounded medications prepared by compounding pharmacies may include:
- Testosterone cypionate injections
- Vitamin B-12 injections
- Compounded ophthalmic drops
- Sterile hormone injections
- Pain management injections
- Custom preservative-free eye drops
Pharmacies may also evaluate container closure systems, such as vials and syringes, when assigning beyond-use dates to sterile preparations.
7. Ingredient Verification Is an Ongoing Process
Ingredient verification does not end after the first purchase. Pharmacies may conduct ongoing monitoring activities such as:
- Periodic re-verification of vendor licensure
- Review of inspection histories and recalls
- Re-testing when suppliers, manufacturing sites, or lots change
- Documentation within the pharmacy’s quality management system
These processes are part of a pharmacy’s broader quality management system governing compounded medications
What Patients Can Do to Learn More About Their Compounded Medication
Patients who receive compounded medications may wish to understand where their medication is prepared and how it is obtained. Patients can ask their healthcare provider which pharmacy prepares the medication and whether it comes from a state-licensed compounding pharmacy. For example, if a medication such as a GLP-1 injection, vitamin injection, or hormone injection is administered in a clinic, patients may ask which pharmacy supplies the medication and whether they can contact the pharmacy directly with questions. Understanding where a medication is prepared and who the pharmacy is can help patients be more informed about their treatment.