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What’s in compounded semaglutide? Ingredients, additives and why vials differ
Semaglutide, a sterile liquid it’s mixed in and, at some pharmacies, an added vitamin or amino acid. Here’s what each one is, why two vials can look different, and how to read your label.
- Every ingredient, in plain words
- Why some vials look red
- How to read your label
Published by NexLifeLegitScript-certifiedPublished October 8, 2026Medically reviewed by the NexLife clinical team, led by Adam Kennah, MD (NPI 1144260043)
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Quick answer: what’s in a compounded semaglutide vial?
Compounded semaglutide contains semaglutide, the active ingredient, dissolved in a sterile liquid made for injection, with inactive ingredients such as a preservative in multiple-dose vials. Some pharmacies also add an ingredient, such as vitamin B12 (cyanocobalamin), vitamin B6 (pyridoxine), glycine or niacinamide; B12 is why some vials look red. The FDA warns that some compounders have used salt forms of semaglutide, which are different active ingredients from the one in the approved drugs. Formulations differ by pharmacy, so your label is the list that counts for your vial. Compounded semaglutide is not FDA-approved and is not the same as Wegovy or Ozempic.
- Semaglutide, the active ingredient
- Some pharmacies add B12, B6, glycine or niacinamide
- Salt forms aren’t the same ingredient
- Your label lists what’s in yours
On compounded tirzepatide? See what’s in compounded tirzepatide.
What’s in a compounded semaglutide vial
Ingredient by ingredient. Your label shows which ones are in yours.
| Ingredient | What it does | In every vial? |
|---|---|---|
| Semaglutide | The active ingredient. It acts on the GLP-1 pathway. | Yes |
| A sterile liquid | The water-based solution the medication is dissolved in, made for injection. | Yes |
| A preservative | Helps keep a multiple-dose vial free of bacteria between doses. Benzyl alcohol is one example. | In multiple-dose vials |
| Salts and pH adjusters | Keep the liquid stable, at the right strength and acidity. | Often |
| An added vitamin or amino acid | Some pharmacies add vitamin B12, vitamin B6, glycine or niacinamide. | Only at some pharmacies |
Exact ingredients and amounts differ by pharmacy. The pharmacy dispenses only on a valid prescription, and the formulation is determined by the prescriber and the pharmacy.
Ingredients some pharmacies add
What each one is, and what’s known about it.
| Added ingredient | What it is | What to know |
|---|---|---|
| Vitamin B12 (cyanocobalamin) | A vitamin your body needs for healthy nerves and red blood cells. | It’s naturally red, so it turns the liquid red or pink. It doesn’t change the semaglutide strength on your label. |
| Vitamin B6 (pyridoxine) | A B vitamin your body uses to process protein. | Pharmacies that add it list it on the label. |
| Glycine | An amino acid, one of the building blocks of protein. Your body makes it too. | Pharmacies don’t all say why they add it. Ask the pharmacy named on your label. |
| Niacinamide | A form of vitamin B3. | Ask the pharmacy named on your label why it’s in your formulation. |
A 2026 study of compounded GLP-1 products found added ingredients in about half of them, and limited evidence for adding vitamins without a documented deficiency.
The FDA says a semaglutide and vitamin B12 injection can still count as essentially a copy of approved products when both amounts are within 10% of the approved strengths.
The FDA hasn’t reviewed compounded combinations for safety, effectiveness or quality.
Why is my semaglutide red?
Most likely, vitamin B12. Cyanocobalamin is naturally dark red, so a vial with B12 looks red or pink, and one without it looks clear. Color doesn’t tell you the strength: the semaglutide strength is printed on your label in mg/mL. If your medication looks different from what you’ve received before, or from what your label describes, don’t use it. Call the pharmacy first.
Semaglutide salts aren’t the same ingredient
The FDA says some compounders have sold salt forms of semaglutide, including semaglutide sodium and semaglutide acetate. These are different active ingredients from the one in Wegovy and Ozempic, and the FDA says it doesn’t have information on whether they have the same chemical and pharmacologic properties. Ask the pharmacy named on your label which form of semaglutide it uses.
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†NexLife Price Match Guarantee: for new members switching from a licensed U.S. telehealth provider with an active prescription for compounded tirzepatide or semaglutide. Send a receipt from the last 60 days and we match your regular all-in monthly price (medication plus required fees), not first-month offers or coupons, for as long as your plan stays active. A NexLife provider must determine that treatment is right for you. Full terms.
Know what’s in your vial.
A compounded medication is only as clear as its label. Yours names the pharmacy and lists what’s inside.
- Vials differ. Two pharmacies can make semaglutide differently.
- Colors confuse. A red vial can mean B12, not a different medicine.
- Labels get skipped. Strength and storage are on the label, not on a website.
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- Clear labels. The pharmacy, strength and beyond-use date on every vial.
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Why two vials can look different
Five reasons, and when to call before you use it.
A different pharmacy.
Each state-licensed pharmacy uses its own formulation, so the ingredients and the look can change if your pharmacy changes.
A different strength.
Pharmacies make semaglutide in different concentrations, measured in mg/mL, so the same dose can be a different amount of liquid.
An added ingredient.
Vitamin B12 makes the liquid red or pink. Without it, the liquid is clear.
A different vial or label.
Vial size, cap color and label layout differ by pharmacy.
Something looks off?
Cloudy liquid, particles, a damaged seal or a label that doesn’t match your prescription: don’t use it, and call the pharmacy. The FDA warns about fraudulent products whose labels name pharmacies that don’t exist.
How to read your label
For your vial, the label is the ingredient list that counts.
| On the label | What it tells you |
|---|---|
| Semaglutide strength | Printed in milligrams per milliliter (mg/mL). Know your dose in milligrams, and ask your pharmacy or provider how much to draw. |
| Added ingredients | Any vitamin or amino acid the pharmacy added, such as cyanocobalamin (B12). |
| Beyond-use date | The date after which the pharmacy says not to use it. |
| Storage directions | How this pharmacy says to store this vial. Follow these, not directions written for other products. |
| Pharmacy name and address | The state-licensed pharmacy that prepared it. If anything looks wrong, call us before you use it. |
Give your dose in milligrams, not syringe units: the same number of units is a different dose at a different strength.
Compounded semaglutide vs Wegovy or Ozempic: what’s different
Side by side.
| At a glance | Compounded semaglutide | Wegovy or Ozempic |
|---|---|---|
| FDA approval | Not FDA-approved | FDA-approved |
| Who makes it | A state-licensed pharmacy, for your prescription | Novo Nordisk |
| Active ingredient | Semaglutide; the FDA warns some compounders have used salt forms instead | Semaglutide |
| Formula | Can differ by pharmacy, and may include an added ingredient | One approved formula, listed in its prescribing information |
| Quality review | No FDA review for safety, effectiveness or quality | Reviewed by the FDA for safety, effectiveness and quality |
| Monthly price at NexLife | $139 at every dose | Not offered by NexLife |
Compounded and brand-name medicines aren’t interchangeable without your prescriber.
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Prices from each provider's website, checked October 5, 2026; Refills and Remedy Meds October 1. Brand-name and compounded medications are different products. Compounded medications are not FDA-approved. †Price match terms apply.
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- Tirzepatide: compounded, acts on two hormone pathways (GIP and GLP-1), taken once a week
- Semaglutide: compounded, acts on the GLP-1 pathway, taken once a week
- Prepared by U.S.-licensed 503A pharmacies; every batch lab-tested
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Prescription required. Compounded medications are not FDA-approved. On 12-month plans: $139 a month for tirzepatide, $119 for semaglutide, still the same at every dose.
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| Month one | Month two | Month three | Every month after | |
|---|---|---|---|---|
| Tirzepatide | $169 | $169 | $169 | $169 |
| Semaglutide | $139 | $139 | $139 | $139 |
Month-to-month plan, all-inclusive. Longer plans cost less and stay flat. Tirzepatide is $159, $149 and $139 a month on 3-, 6- and 12-month plans. Semaglutide is $132, $125 and $119.
Prescribed for you, at one flat price
The same price at every dose.
| Plan | Semaglutide, per month |
|---|---|
| Month to month | $139 |
| 3-month plan | $132 |
| 6-month plan | $125 |
| 12-month plan | $119 |
Included in every plan: a licensed provider who follows your dose, 24/7 support, a personalized nutrition plan and a 1:1 coaching call. Your medication comes from U.S.-licensed 503A pharmacies, with every batch lab-tested. Our partner pharmacy usually ships within 1 to 2 business days, with free expedited shipping. HSA and FSA accepted. No membership fee.
Switching from another provider? NexLife matches the regular all-in monthly price you pay today for compounded tirzepatide or semaglutide.† How switching works
† For new members switching from a licensed U.S. telehealth provider with an active prescription; send a receipt from the last 60 days. Not open to people with Medicare, Medicaid or TRICARE coverage. Full terms.
NexLife at a glance, with licenses, pharmacies, prices and contact details, is on one page.
What’s in compounded semaglutide: your questions, answered
What’s in compounded semaglutide?
Compounded semaglutide contains semaglutide, the active ingredient, dissolved in a sterile liquid made for injection, with inactive ingredients such as a preservative in multiple-dose vials. Some pharmacies also add an ingredient, such as vitamin B12 (cyanocobalamin), vitamin B6 (pyridoxine), glycine or niacinamide; B12 is why some vials look red. The FDA warns that some compounders have used salt forms of semaglutide, which are different active ingredients from the one in the approved drugs. Formulations differ by pharmacy, so your label is the list that counts for your vial. Compounded semaglutide is not FDA-approved and is not the same as Wegovy or Ozempic.
What ingredients are commonly added to compounded semaglutide?
Pharmacies that add an ingredient use vitamin B12 (cyanocobalamin), vitamin B6 (pyridoxine), glycine or niacinamide, among others. Not every pharmacy adds anything. Your label lists what’s in your vial.
Why is my semaglutide red?
Most likely because it contains vitamin B12 (cyanocobalamin), which is naturally dark red. If it looks different from what you’ve received before, or from what your label describes, don’t use it. Call the pharmacy first.
Does compounded semaglutide contain B12?
Some versions do. It depends on the pharmacy and the formulation your prescriber orders. If your label lists cyanocobalamin, your vial contains B12, which is why it looks red.
Why does semaglutide contain glycine?
Only some versions do. Glycine is an amino acid, and the pharmacy decides whether to include it in its formulation. The FDA hasn’t reviewed compounded combinations, and a 2026 study found limited evidence behind added ingredients. Ask the pharmacy named on your label why it’s there.
Do all compounding pharmacies use the same formulation?
No. The formulation is determined by the prescriber and the pharmacy, so the strength, added ingredients, preservative and vial size can differ. That’s why your label, not a website, is the list that counts.
Why can two compounded semaglutide vials look different?
They may come from different pharmacies, have different strengths in mg/mL, or have an added ingredient such as B12, which turns the liquid red. If a vial looks different from what you’ve received before, call the pharmacy before you use it.
Does B12 make semaglutide weaker?
No. Your dose depends on the semaglutide strength printed on your label, in milligrams per milliliter, whatever else is in the vial. Know your prescribed dose in milligrams, and ask the pharmacy or your provider how much to draw.
Is semaglutide with B12 better than semaglutide with B6?
Neither has been shown to be better. The FDA hasn’t reviewed either one, and a 2026 study found limited evidence for adding vitamins without a documented deficiency.
Is semaglutide sodium the same as semaglutide?
No. The FDA says semaglutide sodium and semaglutide acetate are different active ingredients from the one in the approved drugs, and that it doesn’t know whether they have the same chemical and pharmacologic properties.
Is compounded semaglutide the same as Wegovy or Ozempic?
No. Wegovy and Ozempic are FDA-approved medicines made by Novo Nordisk to one approved formula. Compounded semaglutide is prepared by a state-licensed pharmacy for your prescription, its formulation can differ, and it isn’t FDA-approved.
What should my label show?
The semaglutide strength in mg/mL, any added ingredients, a beyond-use date, storage directions, and the name and address of the pharmacy that prepared it. If something looks wrong, call before you use it.
What does compounded semaglutide cost at NexLife?
$139 a month at every dose, or $119 a month on a 12-month plan, with no membership fee. Any authorization charge is refunded in full if you’re not prescribed.
Important safety information
Compounded tirzepatide and semaglutide are not FDA-approved. The FDA has not reviewed them for safety, effectiveness or quality. The risks below come from the labeling of the FDA-approved medicines.
Both medicines may cause tumors in the thyroid, including thyroid cancer. In studies with rodents they caused thyroid tumors, and it isn't known whether they cause them in people. Don't use either if you or anyone in your family has had medullary thyroid carcinoma (MTC), or if you have multiple endocrine neoplasia syndrome type 2 (MEN 2). Tell your clinician if you notice a lump or swelling in your neck, hoarseness, trouble swallowing or shortness of breath.
Serious side effects can include inflammation of the pancreas (pancreatitis), gallbladder problems, low blood sugar (especially with insulin or sulfonylureas), kidney problems from dehydration, severe stomach problems, serious allergic reactions, vision changes in people with type 2 diabetes, and depression or thoughts of suicide. Tell your care team before any surgery or procedure that uses anesthesia or deep sedation. Don't combine either medicine with other GLP-1 medicines.
Tirzepatide can make birth control pills less effective: use another method for 4 weeks after you start and after each dose increase. Semaglutide should be stopped at least 2 months before a planned pregnancy. Tell your clinician if you're pregnant, planning to be, or breastfeeding.
This is a summary, not the complete safety information. Read the full Prescribing Information for FDA-approved tirzepatide (Zepbound) and semaglutide (Wegovy), and talk with your clinician. You can report side effects to the FDA at 1-800-FDA-1088 or fda.gov/medwatch.
The people behind this page
A guide is only as good as the people who stand behind it. Here's who checked this page, and the rules we hold ourselves to.
Adam Kennah, MDMedical Director, NexLife · Board-certified in emergency medicine · NPI 1144260043
Leads the NexLife clinical team, which medically reviewed this page on October 6, 2026.
NexLife editorial teamResearch and pricing
Checked FDA guidance, prescribing information and the 2026 study on October 6, 2026. Sources are linked at the bottom of this page.
- Every fact, sourced. Each ingredient fact links to the page it comes from.
- Only what's published. Every figure comes from the provider's own website, never from guesswork.
- How we make money. NexLife is one of the providers on this page, and we earn revenue when people join NexLife.
- Corrections, fast. See something wrong or out of date? Email care@nexlife.us and we'll fix it.
Your dose goes up. Your price doesn’t.
Know what’s in your vial, and who made it.
Start with a few minutes online. A licensed physician reviews your history and decides what’s right for you.
- 1Tell us about you
A short online health assessment. It takes a few minutes.
- 2A licensed provider reviews it
You're prescribed only if treatment is right for you.
- 3Delivered, then supported
We send your prescription to our partner pharmacy, which usually ships within 1 to 2 business days. Shipping is free, and support is 24/7.
Sources
- U.S. Food and Drug Administration. FDA’s concerns with unapproved GLP-1 drugs used for weight loss. Content current as of October 1, 2026.
- U.S. Food and Drug Administration. FDA clarifies policies for compounders as national GLP-1 supply begins to stabilize. Content current as of April 1, 2026.
- Belcourt J, Sapowadia A, White CM. Compounded semaglutide and tirzepatide products use unique formulations but efficacy and safety largely unknown. Annals of Pharmacotherapy, February 2026.
- Cyanocobalamin injection, USP: prescribing information.
- Wegovy (semaglutide) prescribing information. Novo Nordisk.
- NexLife. Compounded semaglutide plans, checked October 6, 2026.
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