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Evidence-based GLP-1 & peptide discussion since 2023
ForumsLab Results & BiomarkersVitamin B12 monitoring — deficiency prevalence on GLP-1 therapy Page 2

Vitamin B12 monitoring — deficiency prevalence on GLP-1 therapy

B12Beth Wed, Mar 4, 2026 at 4:16 PM 22 replies 530 viewsPage 2 of 5
MaxMetOK
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Oklahoma
Mar 4, 2026 at 7:06 PM#6

Agreed. My doctor said the same thing about Vitamin B12.

Last edited: Mar 5, 2026 at 12:06 AM
33 17PharmHunterJen, TomTeleRx, DoseLogDan and 30 others
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Dr.GastroMayo
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Mayo Clinic, MN
Mar 4, 2026 at 7:23 PM#7

As a healthcare provider, I want to add some clinical context to this discussion on Vitamin B12 monitoring deficiency.

Building on what Dr.PulmRoch said — the evidence base here is well-established. The key publications to reference are from the SURMOUNT program[1].

Key clinical points:

  1. Efficacy is dose-dependent and typically requires 4-5 weeks to reach steady state
  2. Side effect profile is predictable and usually manageable with standard protocols
  3. Monitoring should include baseline labs and follow-up at 3-month intervals
  4. Patient education significantly improves outcomes and adherence

Standard disclaimer: this is educational, not individualized medical advice.

References:
[1] See thread title for relevant study identification.
6 6VendorMark, COA_Karl, MikeFit_NJ and 3 others
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SallyK_inj
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Iowa
Mar 4, 2026 at 7:40 PM#8

Reading this thread on Vitamin B12 monitoring hits close to home. Night shift nurse — I started at 287 lbs and felt like I would tried everything.

13 months on tirz and I am a different person. Not just the 62 lbs lost — my energy, my mood, my relationship with food. All transformed.

If you are on the fence about Vitamin B12 — take the leap. It was the best health decision I have ever made. ❤️

26 4oliver_london, tane_welly, Dr.PathRoch and 23 others
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rick_sfbay
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San Francisco, CA
Mar 4, 2026 at 7:57 PM#9

Dr.RaviCardio — that is really helpful context on Vitamin B12 monitoring . Follow-up question: what labs did your doctor order to monitor this?

I am in a similar situation (just started) and trying to set realistic expectations.

Last edited: Mar 5, 2026 at 1:57 AM
39 7FranDenver, Dr.BariatricHTX, LindaRN_retired and 36 others
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Dr.RenalNash
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Nashville, TN
Mar 4, 2026 at 8:14 PM#10

To answer SallyK_inj's question specifically:

From a clinical standpoint, Vitamin B12 monitoring is an area where we have good evidence.

The short answer: baseline labs + quarterly monitoring is the standard of care.

The longer answer involves understanding the mechanism of action at the receptor level, which I am happy to elaborate on if helpful.

23 17maria_elpaso, anders_CPH, Dr.NutriCornell and 20 others
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