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c/compounding·posted 5 months ago by u/niels_roos

why does nobody talk about API source

Explainer Long Haul ×9 Well Actually ×2

Something I noticed reading old threads that I have not seen said out loud.

The advice on 503B in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the same confidence.

I have listed what I think the current consensus is below. Correct me — that is the point of posting it.

1,332 up / 271 down83% upvoted68 commentsid kuz5ux1 Mar 2026

68 comments

30 in this archive, depth 4

best — the order this archive was captured in

u/kavya_kravchenko131 points·5 months ago

shortage list status is API source, check the actual list

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u/niels_roosOP48 points·5 months ago

503B compounding is different from 503A, different rules, different legality

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u/eu_apotheke_a156 points·5 months ago

Yeah, 503A and 503B are different regulatory animals.

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u/elise_ramos39 points·5 months ago

the 503A/503B distinction is load-bearing, do not blur it

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u/yannick_barros13 points·4 months ago

API transparency is the question that separates good compounders from sketchy ones

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u/tb500_tangent127 points·4 months ago

Rodent data is rodent data. Dose scaling is not linear and the models tell you what to investigate, not what to expect.

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u/usp_appendixMOD66 points·4 months ago

Retitled to remove editorialising. Put the evidence in the body.

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u/bruno_dumitru61 points·4 months ago

What is the actual shortage list status right now?

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u/camila_sandvik95 points·4 months ago

Mechanistically the bit that matters is 503B. It explains most of the early profile and a decent chunk of the outcome.

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u/niels_roosOP59 points·4 months ago

no pharmacy referral codes, naming is fine, recruiting is not

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u/enzo_ferrari72 points·4 months ago

Strongly agree. API source transparency matters.

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u/niels_roosOP37 points·4 months ago

Did they tell you their API source or dodge the question?

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u/formulary_fighterappeals65 points·4 months ago

no pharmacy referral codes, naming is fine, recruiting is not

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u/elin_ferrari35 points·4 months ago

no pharmacy referral codes, naming is fine, recruiting is not

Adding to this: 503B is doing more work than the comment implies.

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u/camila_sandvik8 points·4 months ago

the shortage list is temporary, it ends and compounding becomes illegal again

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u/santiago_rasmussen62 points·4 months ago·edited

Are we talking 503A or 503B?

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u/pavel_kravchenko26 points·4 months ago

telehealth prescriber models exist, pricing differs by state

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u/solene_eriksen43 points·4 months ago

Small correction: the trial was 10 weeks, not 25. Does not change your point but people will quote it.

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u/step_therapy_s14 points·4 months ago

the Poland situation is different from the US, different regulations

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u/slow_logbook54 points·4 months ago

Disagree. What you are describing is consistent with telehealth, not with what you concluded.

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u/rina_sobczak37 points·4 months ago

Slight fix: the number was 97.6, not 99.3. Decimal point, but a fairly consequential one.

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u/amara_kuipers25 points·4 months ago

Slight fix: the number was 97.6, not 99.3.

Disagree on that part. 99.2% and 98.9% on the same vial is normal.

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[removed]9 points·4 months ago

[removed by moderator]

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u/ruben_cabrera20 points·4 months ago

What is the actual shortage list status right now?

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u/camila_sandvik0 points·4 months ago

the the UK situation is different from the US, different regulations

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u/rania_diallo1 point·4 months ago·edited

telehealth costs shortage list plus compounding markup, total varies

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u/kian_ferreira32 points·5 months ago

This is correct. The shortage list does expire and the rules change.

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u/rt_shift_reggie8 points·5 months ago

Which state? Rules vary.

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u/fatima_kowalski5 points·4 months ago

This is correct. The shortage list does expire and the rules change.

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u/formulary_fighterappeals1 point·4 months ago

the shortage list is temporary, it ends and compounding becomes illegal again

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About c/compounding

Compounded GLP-1s as a supply route: the 503A/503B distinction, the shortage-list mechanics that made compounding legal and then didn't, state board rules, telehealth prescriber models, and what a compounding pharmacy will and will not tell you about its API source.

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c/compounding rules
  1. Regulatory claims need a citation to the actual rule, notice or docket.
  2. No pharmacy referral codes. Naming a pharmacy is fine; recruiting for it is not.
  3. API source questions are on-topic and pharmacies dodging them is newsworthy.
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