# Tirzepatide With Glycine, B6 or Niacinamide

By Ruth Calder, Enforcement Editor (https://glpwatchdog.org/authors/ruth-calder) | Published: 2026-09-27 | Updated: 2026-11-06

Canonical page: https://glpwatchdog.org/research/glp1-with-glycine-b6-or-niacinamide

> What glycine, vitamin B6 and niacinamide are, why compounders add them to tirzepatide and semaglutide, what the evidence shows, and which sellers list them.

Compounded tirzepatide with glycine, vitamin B6 or niacinamide is ordinary compounded tirzepatide with a second ingredient mixed in by the pharmacy. The addition is an amino acid or a vitamin, not a second weight-loss drug.[9][10][11] No published human study shows it does anything for you in this product, and FDA has said the safety and effectiveness of combining semaglutide with other ingredients has not been established.[3] What it changes is the product you are buying, and sometimes the price.

> **About this article.** We do not sell medication. The legal passages come from FDA’s own statements and the federal statute, the study findings from the published papers, and the seller list and prices from our provider register, recalculated each time this page loads. Vitamin B12 has its own page: [why compounded semaglutide is mixed with B12](https://glpwatchdog.org/research/semaglutide-compounded-with-b12).

## What is in the vial

A compounded vial labeled “tirzepatide/glycine” or “semaglutide/pyridoxine” holds two ingredients, sometimes three, because a pharmacy combined them. It is not a brand-name product with something extra in it. Compounded drugs are not FDA-approved, which means nobody at FDA checks their safety, effectiveness or quality before they reach you.[5]

These combinations are common. Pharmacy researchers who searched compounder websites in early 2025 found 33 distinct compounded semaglutide and tirzepatide products, and 48 percent paired the GLP-1 with cyanocobalamin, glycine, niacinamide, docusate or ondansetron.[6] Secret shoppers working in West Virginia and Oklahoma between August and October 2025 reached 75 brick-and-mortar clinics and med spas that sold compounded GLP-1s; 42 of them (56.0 percent) offered a version with B vitamins added.[8] An earlier survey of 93 Colorado websites found B vitamin combinations on 8 and glycine on 1.[7] One site in that survey advertised a GLP-1 compounded with BPC-157; [peptides alongside a GLP-1](https://glpwatchdog.org/research/peptides-alongside-a-glp1) covers that pairing.

## Glycine, B6 and niacinamide: what each one is

*The three additives, what they are, and what sellers in our register say they are for*

| Additive | What it is | What sellers say it does |
| --- | --- | --- |
| Glycine | The simplest amino acid, one of the building blocks of protein.[9] | Muscle preservation and less nausea, as sellers’ reasons are recorded in our register. No study tests either claim for a GLP-1 vial. |
| Vitamin B6 (pyridoxine) | Pyridoxine is a form of vitamin B6, which the body turns into a coenzyme used to make amino acids and neurotransmitters.[10] | Better tolerance of the GLP-1, as one seller puts it. No study tests this for a GLP-1 product. |
| Niacinamide (nicotinamide) | A form of vitamin B3.[11] | The two sellers in our register that list it give no reason on the price listings we recorded. |

## What the evidence shows for each combination

No human study shows a benefit. We searched PubMed for human studies of glycine, vitamin B6 or niacinamide given with semaglutide or tirzepatide, including searches aimed at muscle, lean mass and nausea. None tested the additive against the GLP-1 alone, and none measured a benefit. The hits were animal studies, lab studies of metabolism and reviews.

The published record that does exist is critical. The authors of the 33-product survey wrote that they “found little justification for adding nutrients” to injectable semaglutide or tirzepatide.[6] FDA, writing about semaglutide, named pyridoxine (vitamin B6) among the ingredients compounders add and said the safety and effectiveness of such combinations has not been established.[3] That statement is about semaglutide. FDA has not published a parallel one about tirzepatide on the pages we read, and none of those pages mentions glycine or niacinamide.

> **No trial backs these additives.** If glycine protected muscle on tirzepatide, or B6 settled GLP-1 nausea, a trial showing it would be the easiest thing on this page to cite. We found none.

## Why the additive matters under FDA’s compounding rules

A state-licensed pharmacy compounding under section 503A may not compound, regularly or in inordinate amounts, drugs that are essentially copies of a commercially available drug product.[2] FDA says it treats a compounded drug as essentially a copy when it has the same active ingredient as an approved product at the same, a similar or an easily substitutable strength, and can be used by the same route. The exception is a change that a prescriber determines and documents produces a significant difference for an identified individual patient.[1]

Adding a second ingredient does not get a product out of that test on its own. FDA says a compounded drug combining active ingredients can still be essentially a copy when those ingredients are each in commercially available products at similar strengths and by the same route, and it used semaglutide with vitamin B12 as its worked example.[1] We cover that example in the [B12 article](https://glpwatchdog.org/research/semaglutide-compounded-with-b12). FDA has not said, on any page we read, how that test applies to glycine, B6 or niacinamide.

Two more FDA positions set the limits. The copy restriction has a volume floor: at four prescriptions or fewer of one product in a calendar month, FDA says it does not intend to act.[1] And outsourcing facilities under section 503B may compound from bulk ingredients only when FDA has put that ingredient on its 503B bulks list or has the finished drug on its shortage list. FDA states that tirzepatide and semaglutide are on neither list.[1] On April 30, 2026 it proposed keeping them off the bulks list, and as of October 17, 2026 that proposal had not been finalized.[12][13] An added vitamin or amino acid does not change any of this.

## Sellers on our register that list these additives

14 sellers in our register name one of these additives in a price listing or feature list: 9 for glycine, 5 for vitamin B6 and 1 for niacinamide. The price column is each seller’s lowest GLP-1 price we list, whichever formula it belongs to. The last column says whether that cheapest listing is itself the additive formula.

*Sellers listing glycine, B6 or niacinamide, with the lowest GLP-1 price we hold for each*

| Seller | Additive | Where it appears | Lowest GLP-1 price we list | Is that price the additive formula? |
| --- | --- | --- | --- | --- |
| [EdgeRx](https://glpwatchdog.org/reviews/edgerx) | Glycine | Tirzepatide and semaglutide, with B12 | $199/mo | Yes |
| [EOS Health](https://glpwatchdog.org/reviews/eos) | Glycine | Semaglutide (a glycine formula alongside plain) | $169/mo | Yes |
| [Goldspan Health](https://glpwatchdog.org/reviews/goldspan-health) | Glycine | Tirzepatide and semaglutide, B12 or glycine | $229/mo | Yes |
| [HumeCare+](https://glpwatchdog.org/reviews/humecare) | Glycine | Tirzepatide, with B12 | $199/mo | No |
| [Immortals](https://glpwatchdog.org/reviews/immortals) | Glycine | Tirzepatide and semaglutide, with B12 | $167/mo, paid several months up front | Yes |
| [Invyncible](https://glpwatchdog.org/reviews/invyncible) | Glycine | Tirzepatide and semaglutide, with B12, next to a standard formula | $149/mo | Yes |
| [June Health](https://glpwatchdog.org/reviews/june-health) | Glycine | Injectable tirzepatide and semaglutide, B12 or glycine | $187/mo | No |
| [NewSelf](https://glpwatchdog.org/reviews/newself) | Glycine | Listed as a B12 and glycine formulation | $100/mo | No |
| [StackMD](https://glpwatchdog.org/reviews/stackmd) | Glycine | Tirzepatide and semaglutide, with B12 | $125/mo | Yes |
| [Bayan Health](https://glpwatchdog.org/reviews/bayan-health) | Vitamin B6 | Injectable tirzepatide and semaglutide | $99/mo | Yes |
| [June Health](https://glpwatchdog.org/reviews/june-health) | Vitamin B6 | Oral semaglutide tablets | $187/mo | Yes |
| [MadeMed](https://glpwatchdog.org/reviews/mademed) | Vitamin B6 | Sublingual semaglutide | $219/mo, paid several months up front | Yes |
| [MangoRx](https://glpwatchdog.org/reviews/mangorx) | Vitamin B6 | Oral semaglutide tablets | $299/mo | Yes |
| [Vita Bella](https://glpwatchdog.org/reviews/vita-bella) | Vitamin B6 | Tirzepatide and semaglutide | $109/mo | Yes |
| [DadVantage Men's Health](https://glpwatchdog.org/reviews/dadvantage-mens-health) | Niacinamide | Tirzepatide | $216.67/mo | No |

The additive does not carry a consistent premium. At one seller in the table the glycine formula costs more than its plain formula, at another it costs less, and a third charges the same for its B12 and glycine versions. [HumeCare+](https://glpwatchdog.org/reviews/humecare) sells tirzepatide only with B12 and glycine, so there is no plain version to compare; its checkout showed $299 a month after the intake quiz. Compare the formula you are offered with the seller’s plain version, if it has one, before you assume the extra ingredient costs more or is worth more. Full pricing for each seller is on its review page, and the [compounded tirzepatide rankings](https://glpwatchdog.org/best/compounded-tirzepatide) compare them side by side.

Additives also show up where the label is not visible before you order. [CoreAge Rx](https://glpwatchdog.org/reviews/coreage-rx) says its compounded tirzepatide is usually made with vitamin B12 and that you can ask for a version without it at intake. [Lavender Sky Health](https://glpwatchdog.org/reviews/lavender-sky-health) lists each pharmacy’s formulation beside its plans, so you can see whether you are buying tirzepatide with B6, B12, glycine or niacinamide before you book.

## Questions to ask the pharmacy

1. **How much of each ingredient is in one milliliter?** A combination vial has two strengths on its label. Make sure you know which number is the tirzepatide. Our [vial label reader](https://glpwatchdog.org/tools/vial-label-reader) walks through the arithmetic.
2. **How many units on my syringe is my dose?** FDA has received adverse event reports, some involving hospitalization, that may be related to patients measuring and injecting the wrong dose of compounded semaglutide.[4]
3. **Is there a version without the additive, and does it cost less?** Some sellers in the table list both.
4. **Which pharmacy made it, and is it state-licensed?** FDA’s advice is to fill a prescription at a state-licensed pharmacy.[4]
5. **What is the beyond-use date, and how should I store it?** Only 18 percent of the products in the 33-product survey stated a beyond-use date and storage conditions.[6]

> **Talk to your prescriber before switching formulas.** A different vial can mean a different concentration, and a different concentration means a different number of units for the same dose. This page describes the public record on these combinations. It is not advice about your prescription.

For more on reading a compounded vial, see [what is in a compounded GLP-1 vial](https://glpwatchdog.org/research/what-is-in-a-compounded-glp1-vial). For what people report on compounded tirzepatide, see [compounded tirzepatide side effects](https://glpwatchdog.org/research/compounded-tirzepatide-side-effects), and for how compounded and brand products differ, [compounded vs brand semaglutide](https://glpwatchdog.org/research/compounded-semaglutide-vs-brand-semaglutide).

## Frequently asked questions

### Why is glycine added to compounded tirzepatide?

Sellers give muscle preservation and less nausea as reasons. No published human study tests either claim for glycine in a GLP-1 product. Glycine is the simplest amino acid, one of the building blocks of protein, not a weight-loss drug.

### Does vitamin B6 in compounded tirzepatide or semaglutide reduce nausea?

There is no study showing that. A PubMed search for vitamin B6 or pyridoxine, nausea and GLP-1 drugs returned no results. FDA has said the safety and effectiveness of combining semaglutide with added ingredients, pyridoxine among them, has not been established.

### Is compounded tirzepatide with niacinamide FDA approved?

No. Compounded drugs are not FDA approved, and niacinamide is a form of vitamin B3 added by the compounding pharmacy. FDA does not check a compounded drug’s safety, effectiveness or quality before it is sold.

### Does adding glycine or B6 make compounded tirzepatide legal?

Not by itself. FDA says a compounded combination can still be treated as essentially a copy of approved drugs, using semaglutide with vitamin B12 as its example, and the statutory exception requires a prescriber to document a significant difference for an individual patient. FDA has not said publicly how its test applies to glycine, B6 or niacinamide.

## References

1. U.S. Food and Drug Administration FDA clarifies policies for compounders as national GLP-1 supply begins to stabilize. FDA Drug Alerts and Statements (update of April 1, 2026). 2026. https://www.fda.gov/drugs/drug-alerts-and-statements/fda-clarifies-policies-compounders-national-glp-1-supply-begins-stabilize
2. United States Code 21 U.S.C. § 353a, Pharmacy compounding (subsections (b)(1)(D) and (b)(2)). Legal Information Institute, Cornell Law School. 2026. https://www.law.cornell.edu/uscode/text/21/353a
3. U.S. Food and Drug Administration FDA alerts health care providers, compounders and patients of dosing errors associated with compounded injectable semaglutide products. FDA Human Drug Compounding. 2024. https://www.fda.gov/drugs/human-drug-compounding/fda-alerts-health-care-providers-compounders-and-patients-dosing-errors-associated-compounded
4. U.S. Food and Drug Administration FDA’s Concerns with Unapproved GLP-1 Drugs Used for Weight Loss. FDA Postmarket Drug Safety Information. 2026. https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/fdas-concerns-unapproved-glp-1-drugs-used-weight-loss
5. U.S. Food and Drug Administration Human Drug Compounding Laws. FDA Human Drug Compounding. 2026. https://www.fda.gov/drugs/human-drug-compounding/compounding-laws-and-policies
6. Belcourt J, Sapowadia A, White CM. Compounded Semaglutide and Tirzepatide Products Use Unique Formulations but Efficacy and Safety Largely Unknown. Ann Pharmacother 2026;60(9):902-906. 2026. PMID: 41689811. DOI: 10.1177/10600280261421979. https://pubmed.ncbi.nlm.nih.gov/41689811/
7. DiStefano MJ, Dardouri M, Moore GD, Saseen JJ, Nair KV. Compounded glucagon-like peptide-1 receptor agonists for weight loss: the direct-to-consumer market in Colorado. J Pharm Policy Pract 2025;18(1):2441220. 2025. PMID: 39776466. DOI: 10.1080/20523211.2024.2441220. https://pubmed.ncbi.nlm.nih.gov/39776466/
8. DiStefano MJ, Tilley A, Paratane D, Gyimah Gyamfi H, Moore GD, Nair KV. Postshortage Compounded GLP-1 RA Market in 2 States With Potentially High Demand. JAMA Health Forum 2026;7(7):e262207. 2026. PMID: 42467450. DOI: 10.1001/jamahealthforum.2026.2207. https://pubmed.ncbi.nlm.nih.gov/42467450/
9. National Center for Biotechnology Information PubChem Compound Summary for CID 750, Glycine. PubChem, U.S. National Library of Medicine. 2026. https://pubchem.ncbi.nlm.nih.gov/compound/750
10. National Center for Biotechnology Information PubChem Compound Summary for CID 1054, Pyridoxine. PubChem, U.S. National Library of Medicine. 2026. https://pubchem.ncbi.nlm.nih.gov/compound/1054
11. National Center for Biotechnology Information PubChem Compound Summary for CID 936, Nicotinamide. PubChem, U.S. National Library of Medicine. 2026. https://pubchem.ncbi.nlm.nih.gov/compound/936
12. U.S. Food and Drug Administration List of Bulk Drug Substances for Which There Is a Clinical Need Under Section 503B of the Federal Food, Drug, and Cosmetic Act. Federal Register (2026-08552), 91 FR 23431. 2026. https://www.federalregister.gov/documents/2026/05/01/2026-08552/list-of-bulk-drug-substances-for-which-there-is-a-clinical-need-under-section-503b-of-the-federal
13. U.S. Food and Drug Administration List of Bulk Drug Substances for Which There Is a Clinical Need Under Section 503B of the Federal Food, Drug, and Cosmetic Act; Extension of Comment Period. Federal Register (2026-12937). 2026. https://www.federalregister.gov/documents/2026/06/26/2026-12937/list-of-bulk-drug-substances-for-which-there-is-a-clinical-need-under-section-503b-of-the-federal

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Cite as: GLP Watchdog, Ruth Calder, "Tirzepatide With Glycine, B6 or Niacinamide", published 2026-09-27, updated 2026-11-06. https://glpwatchdog.org/research/glp1-with-glycine-b6-or-niacinamide

Canonical HTML page: https://glpwatchdog.org/research/glp1-with-glycine-b6-or-niacinamide

Medical disclaimer: Nothing here is medical advice. We report on this subject; we do not treat anyone. Whether to begin a medication, supplement, or treatment, whether to adjust it, and whether to stop are questions for a clinician licensed to answer them, who knows your history.