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ForumsCompounding & FormulationMy 503A vs 503B pharmacy comparison — same peptide, different results Page 3

My 503A vs 503B pharmacy comparison — same peptide, different results

COA_Karl Sat, Feb 21, 2026 at 12:07 AM 11 replies 553 viewsPage 3 of 3
Dr.GastroMayo
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Mayo Clinic, MN
Feb 21, 2026 at 4:22 AM#11
BiostatsBrad said:
5%, triglycerides 233 → 103 mg/dL, hsCRP 8

This is exactly right. BiostatsBrad articulated what I have been trying to explain to my doctor for months. The My 503A vs 503B pharmacy aspect is the most important factor.

50 14mike_nyc, VendorMark, COA_Karl and 47 others
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hank_denver
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Sep 2024
Denver, CO
Feb 21, 2026 at 4:39 AM#12

Relevant to My 503A vs 503B pharmacy — here is my latest bloodwork comparison:

Key improvements: A1C 7.6% → 5.5%, triglycerides 241 → 111 mg/dL, hsCRP 8.0 → 1.1 mg/L. All on tirzepatide for 9 months.

The inflammatory marker drop is what impresses me most. Consistent with the SELECT trial's cardiovascular findings.

Last edited: Feb 21, 2026 at 8:39 AM
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DeniseRN_TPA
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Aug 2024
Tampa, FL
Feb 21, 2026 at 4:56 AM#13

Thank you carl_compliance! This is incredibly helpful. Taking this to my next appointment. 🙏

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mark_tokyo
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Jun 2024
Tokyo, JP
Feb 21, 2026 at 5:13 AM#14

Dr.GastroMayo — that is really helpful context on My 503A vs 503B pharmacy. Follow-up question: did you change anything about your diet at the same time?

I am in a similar situation (month 2) and trying to set realistic expectations.

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Dr.PulmRoch
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Jun 2024
Rochester, MN
Feb 21, 2026 at 5:30 AM#15

To answer DeniseRN_TPA's question specifically:

From a clinical standpoint, My 503A vs 503B pharmacy is well-supported by the literature.

The short answer: follow the standard titration protocol and reassess at 4-6 weeks.

The longer answer involves pharmacokinetic considerations around steady-state concentrations, which I am happy to elaborate on if helpful.

39 22KristenIndy, MarkLI_maint, Dr.PeteFamMed and 36 others
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