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Endotoxin testing in compounded injectables — looking for input

rick_sfbay Wed, Sep 10, 2025 at 5:43 PM 35 replies 1,765 viewsPage 5 of 7

gary_naperville

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Oct 2024

Naperville, IL

Oct 9, 2025 at 3:16 PM#21

josh_phd_bmore said:
Compounding pharmacy red flag checklist for compounded supply — if ANY of these apply, find a different source: No verifiable physical address No…

503A vs 503B compounding pharmacies for compounded supply — this distinction matters enormously:

Feature	503A	503B
Regulation	State Board of Pharmacy	FDA-registered
Prescription	Required (patient-specific)	Can compound without patient Rx
Testing	Varies by state	cGMP required
Scale	Small batches	Larger production
Quality consistency	Variable	Generally higher

I strongly recommend 503B facilities. The FDA oversight and cGMP requirements mean more consistent product quality.

32 5SleepFixSam, PurityPaulOR, MaxMetOK and 29 others

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carl_compliance

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Nov 2024

Raleigh, NC

Oct 21, 2025 at 8:17 AM#22

josh_phd_bmore said:
Compounding pharmacy red flag checklist for compounded supply — if ANY of these apply, find a different source: No verifiable physical address No…

Genuinely useful, thank you. I had the facts and not the framework.

Last edited: Oct 21, 2025 at 11:17 AM

33 6BrianDallas92, labquiet_amy, emily_PDX and 30 others

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JenPlateau

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Nov 2024

Missouri

Nov 2, 2025 at 1:11 AM#23

From the other side of the consultation, briefly.

Regarding compounded supply compounding legality: compounding pharmacies can legally produce semaglutide and tirzepatide while these drugs remain on the FDA shortage list. If/when the shortage resolves, the legal landscape may change.

Stay informed. The FDA shortage list is updated regularly. Current status as of my last check: semaglutide partially resolved shortage, tirzepatide still in shortage. This directly impacts compounding availability.

Last edited: Nov 2, 2025 at 7:11 AM

34 7RunnerRach, TrialNerd_Beth, HPLC_Greg and 31 others

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Sigma-Aldrich — Research-Grade Standards

Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.

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steph_laguna

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Nov 2024

Laguna Beach, CA

Nov 13, 2025 at 5:58 PM#24

JenPlateau said:
Regarding compounded supply compounding legality: compounding pharmacies can legally produce semaglutide and tirzepatide while these drugs remain on…

Adding a me-too, because a thread of one person's experience is not much use. Nothing to add that would improve it.

Last edited: Nov 13, 2025 at 11:58 PM

35 8DanielChem_CHI, marco_milano, pam_columbus and 32 others

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LarryQC_SD

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Jan 2024

San Diego, CA

Nov 25, 2025 at 10:38 AM#25

JenPlateau said:
Regarding compounded supply compounding legality: compounding pharmacies can legally produce semaglutide and tirzepatide while these drugs remain on…

Compounded semaglutide formulations for compounded supply: some pharmacies add ingredients like B12, L-carnitine, or BPC-157 to their semaglutide preparations. Are these beneficial or marketing gimmicks?

My take: B12 addition has some logic (GLP-1s can deplete B12). L-carnitine evidence is weak. BPC-157 for GI protection is theoretically interesting but unproven. I prefer straight semaglutide with no additives — fewer variables, cleaner data on what's working.

36 9dan_philly, MeganSA_TX, LarryQC_SD and 33 others

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