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Semaglutide with B12: what it does, and what else is in your vial
By the NexLife Medical Team · Medically reviewed by Adam Kennah, MD · Updated
Semaglutide with B12 is compounded semaglutide with vitamin B12 added, but a 2026 review found limited evidence for adding vitamins without a documented deficiency (checked November 1, 2026). It isn’t FDA-approved, and its formula can differ by pharmacy. Your label should say semaglutide, not semaglutide sodium or acetate; the FDA says it isn’t aware of any lawful basis to compound those.
- Label says “sodium” or “acetate”? Text us before you use it
- Pink vial? Usually B12
- Questions about your vial? Call us, not the pharmacy
Compounded semaglutide ingredients, in short
- Active ingredient
- Semaglutide (
GLP-1 ) - Watch for
- Salt forms: semaglutide sodium or acetate
- Base
- A sterile liquid for injection
- Preservative
- In multiple-dose vials
- Possible add-in
- Vitamin B12, at some pharmacies
Not sure what your label says? Call or text
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Compounded medicines aren’t FDA-approved. A NexLife provider prescribes one only if it offers a significant difference for you compared with an FDA-approved medicine.
At a glance
What is semaglutide with B12? 5 quick answers
The short answers. Your label has the final word on what’s in your vial.
| Question | Answer |
|---|---|
| What is semaglutide with B12? | Compounded semaglutide with vitamin B12 (cyanocobalamin) added. Only some pharmacies add it. |
| Does the added B12 help? | A 2026 review found limited evidence for adding vitamins without a documented deficiency. |
| Why is the liquid pink? | B12 turns it red or pink. It doesn’t change the semaglutide strength on your label. |
| Is it FDA-approved? | No. Compounded semaglutide isn’t, with or without B12, and its formula can differ by pharmacy. |
| What should your label say? | Semaglutide, not semaglutide sodium or acetate. The FDA says it isn’t aware of any lawful basis to compound those. |
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Key takeaways
- Semaglutide with B12 is compounded semaglutide with B12 added; a 2026 review found limited evidence for adding vitamins without a documented deficiency.
- What’s in a vial: semaglutide in a sterile liquid, usually with a preservative, and sometimes vitamin B12.
- Your label should say semaglutide, not semaglutide sodium or acetate. The FDA isn’t aware of any lawful basis to compound those.
- A pink or red vial usually means B12. It changes the color, not the semaglutide strength on your label.
- Add-ins are common: the same review found them in about half of compounded
GLP-1 products, which aren’t FDA-approved. - At NexLife, compounded semaglutide is $119 a month on the 12-month plan. Vial questions? Call or text (949) 818-8000, 24/7.
The check
How is semaglutide different from semaglutide sodium or acetate?
| On the label | What it is | What to know |
|---|---|---|
| Semaglutide | Not a salt form | What your label should say |
| Semaglutide sodium | A salt form of semaglutide | The FDA says it isn’t aware of any lawful basis to compound salt forms |
| Semaglutide acetate | A salt form of semaglutide | The FDA says it isn’t aware of any lawful basis to compound salt forms |
If a label or a seller lists a salt form, call or text us at
“These salt forms, including semaglutide sodium and semaglutide acetate, are different active ingredients than are used in the approved drugs.”
U.S. Food and Drug Administration, FDA’s concerns with unapprovedGLP-1 drugs used for weight loss
The basics
What are the ingredients in compounded semaglutide?
| Ingredient | What it does | In every vial? |
|---|---|---|
| Semaglutide | The active ingredient. It acts on the | Yes |
| A sterile liquid | The water-based solution it’s dissolved in, made for injection. | Yes |
| A preservative | Keeps a multiple-dose vial free of bacteria between doses. | In multiple-dose vials |
| Salts and pH adjusters | Keep the liquid stable. | Often |
| An added vitamin | For example, B12 (cyanocobalamin). | Only at some pharmacies |
Formulations differ by pharmacy; your prescriber and the pharmacy decide. Your label is the list that counts.
What’s in compounded semaglutide, line by line.
Base or salt, B12 or not, the answer is on your label. Here’s how to read it.
- Salts matter. The FDA says it isn’t aware of any lawful basis to compound semaglutide sodium or acetate.
- Add-ins vary. Some pharmacies add B12, which can tint the liquid pink or red.
- The label decides. Strength, ingredients and beyond-use date are printed for your vial.
A named pharmacy. A label you can read.
- Prescribed for you. A licensed provider reviews your history before anything is prescribed.
- Clear labels. The pharmacy, strength and beyond-use date on every vial.
- $119 a month on the 12-month plan, at every dose. Or $139 month to month, with no membership.
Real people, real answers. Questions about what’s on your label? Ask us. Call or text
Check my eligibilityCompounded, not FDA-approved: a licensed provider prescribes it only when it offers a significant difference for you.
Side by side
How is compounded semaglutide different from Wegovy and Ozempic?
| Compounded semaglutide | Wegovy pen | Ozempic pen | |
|---|---|---|---|
| FDA-approved? | No | Yes, for weight management and more | Yes, for type 2 diabetes and more |
| Doses per container | Several, from one vial | One dose per pen | Several doses per pen |
| Preservative | Usually, in multiple-dose vials | Not needed in a single-dose pen | Yes (phenol) |
| Added vitamins | Sometimes, such as B12 | No | No |
| Who makes it | A state-licensed pharmacy, for your prescription | Novo Nordisk | Novo Nordisk |
From the Wegovy and Ozempic prescribing information. Compounded and brand-name medicines aren’t interchangeable without your prescriber.
“…the agency does not review compounded drugs for safety, effectiveness or quality before they are marketed.”
U.S. Food and Drug Administration, FDA’s concerns with unapprovedGLP-1 drugs used for weight loss
Add-ins
What does semaglutide with B12 do?
Why it’s there. Some pharmacies add vitamin B12 to semaglutide. They don’t all say why.
What’s known. A 2026 review of compounded
What it changes. The color: B12 turns the liquid red or pink. Not the semaglutide strength on your label.
What the FDA says. In its example, a
“FDA may consider a compounded drug product that combines semaglutide API and another API, such as vitamin B12 (cyanocobalamin), to be essentially a copy of a commercially available drug product…”
U.S. Food and Drug Administration, FDA clarifies policies for compounders as nationalGLP-1 supply begins to stabilize
Timeline
What has changed for compounded semaglutide, and when?
The dated steps behind what can go in your vial, newest first, each with its source.
The FDA updated its page on unapproved
GLP-1 drugs. It says semaglutide sodium and acetate are different active ingredients from the ones in approved drugs. FDAThe Fifth Circuit upheld the FDA’s decision that the semaglutide shortage is over. Fifth Circuit
The FDA reminded compounders of the conditions they must meet under sections 503A and 503B. Semaglutide isn’t on its drug shortage list. FDA
A review in Annals of Pharmacotherapy found added ingredients in about half of compounded
GLP-1 products, and limited evidence for adding vitamins without a documented deficiency. Annals of PharmacotherapyThe FDA declared the semaglutide shortage, which began in 2022, resolved. Its grace period ran to April 22, 2025, for 503A pharmacies and May 22, 2025, for 503B facilities. FDA
Your label
How do you read a compounded semaglutide label?
- The semaglutide strength, in mg per mL. Know your dose in milligrams.
- Any added vitamin, such as cyanocobalamin (B12)
- The beyond-use date, and how to store this vial
- The pharmacy that prepared it, and the first thing to check against compounded
GLP-1 recalls. Questions still come to us: call or text us at(949) 818-8000 , 24/7.
Dose in milligrams, not units. At 2.5 mg per mL, 10 units (0.1 mL) is 0.25 mg of semaglutide; at 5 mg per mL, the same 10 units is 0.5 mg. If the strength on a new vial is different, don’t guess. Call or text us before your next dose.
NexLife
At NexLife: which pharmacy prepares your semaglutide vial?
Prescriptions are filled by Absolute Pharmacy (Lutz, FL) and Boudreaux’s New Drug Store (Lake Charles, LA), each state-licensed; which one fills your prescription depends on your location, your provider’s direction and pharmacy availability.
Looks off? Don’t use it. Call us.
Cloudy liquid, particles, a damaged seal or a label that doesn’t match your prescription: call or text
Step by step
How do you check what’s in your semaglutide vial, step by step?
Five checks on your label and vial before your next dose. Your label has the final word.
- Check the name. Your label should say semaglutide, not semaglutide sodium or acetate: the FDA says it isn’t aware of any lawful basis to compound those. If it lists one, call before you use it.
- Find the strength, in mg per mL. Know your dose in milligrams, not units. At 2.5 mg per mL, 10 units (0.1 mL) is 0.25 mg; at 5 mg per mL, the same 10 units is 0.5 mg.
- Look for an added vitamin. Vitamin B12 (cyanocobalamin) is listed when it’s there. It turns the liquid red or pink but doesn’t change the semaglutide strength on your label.
- Read the date and the pharmacy. The label gives the beyond-use date, how to store this vial and the pharmacy that prepared it, the first thing to check against compounded GLP-1 recalls.
- Look at the liquid and the seal. Cloudy liquid, particles, a damaged seal or a label that doesn’t match your prescription: don’t use it. At NexLife, call or text (949) 818-8000, 24/7, and we check with the pharmacy.
If anything looks different from your last vial, don’t guess: ask before your next dose.
Vial math
How many units is your semaglutide dose?
It depends on your vial’s strength. Here are the Wegovy label’s dose steps at two example strengths.
| Weeks | Weekly dose | At 2.5 mg/mL | At 5 mg/mL |
|---|---|---|---|
| 1 to 4 | 0.25 mg | 0.1 mL (10 units) | 0.05 mL (5 units) |
| 5 to 8 | 0.5 mg | 0.2 mL (20 units) | 0.1 mL (10 units) |
| 9 to 12 | 1 mg | 0.4 mL (40 units) | 0.2 mL (20 units) |
| 13 to 16 | 1.7 mg | 0.68 mL (68 units) | 0.34 mL (34 units) |
| 17 onward | 2.4 mg | 0.96 mL (96 units) | 0.48 mL (48 units) |
The math: mL = dose ÷ strength (mg per mL); units = mL × 100. At 2.5 mg/mL, 1 mg is 1 ÷ 2.5 = 0.4 mL, or 40 units. At 5 mg/mL, the same 1 mg is 0.2 mL, or 20 units.
Both strengths are examples only. The same dose is a different number of units at a different strength, so read the strength on your own vial’s label. Your prescription sets your dose and schedule, which may differ from these label steps. Every step: the semaglutide dosage chart.
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Semaglutide
Weekly
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Compounded, not FDA-approved. A licensed provider prescribes it only when it offers a significant difference for you. Vials shown are illustrations. Always use the strength on your pharmacy’s label. Every plan and price · Price Match Guarantee† terms
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Semaglutide ingredients: your questions
Fair questions about NexLife
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What is semaglutide sodium?
A salt form of semaglutide. The FDA says salt forms like semaglutide sodium and semaglutide acetate are different active ingredients from the ones used in approved drugs. If a label or a seller lists one, call or text us at (949) 818-8000 before you use it, and we’ll check with the pharmacy.
Is semaglutide acetate the same as semaglutide?
No. It’s a salt form, and the FDA says it isn’t aware of any lawful basis to compound salt forms like semaglutide acetate or sodium. Your label should say semaglutide, with no “sodium” or “acetate” after it, along with the strength in mg per mL and a beyond-use date.
Does compounded semaglutide have B12?
Some formulations do, and your label lists vitamin B12 (cyanocobalamin) when it’s there. B12 turns the liquid red or pink, but it doesn’t change the semaglutide strength on your label. A 2026 review found limited evidence for adding vitamins without a documented deficiency. None of these formulations is FDA-approved.
Is compounded semaglutide the same as Ozempic or Wegovy?
No. It isn’t FDA-approved, and its formula can differ by pharmacy. Wegovy and Ozempic each have one approved formula, made by Novo Nordisk. A compounded vial holds several doses and usually has a preservative; a Wegovy pen holds one dose and doesn’t need one. Some compounded versions also add vitamins, such as B12.
What preservative is in compounded semaglutide?
Multiple-dose vials usually contain one, and your label names it. It keeps the vial free of bacteria between doses. Ozempic’s multi-dose pen uses phenol, while Wegovy’s single-dose pens don’t need a preservative. Compounded formulas differ by pharmacy, so the label on your vial is the list that counts.
Why is my semaglutide pink?
Most likely added vitamin B12, which turns the liquid red or pink. The color doesn’t tell you the strength; your label does, in mg per mL. If anything looks different from your last vial, don’t guess. Ask your prescriber’s team before your next dose; at NexLife, call or text (949) 818-8000.
Who do I call if my vial looks wrong?
Don’t use it, and contact the program that prescribed it. At NexLife, call or text (949) 818-8000, 24/7, and we check with the pharmacy for you. Cloudy liquid, particles, a damaged seal or a label that doesn’t match your prescription all count. We come back to you with the next step.
What are the ingredients in compounded semaglutide?
Semaglutide in a sterile liquid, usually with a preservative and sometimes with vitamin B12; formulas differ by pharmacy. The check that matters most is the name: your label should say semaglutide, not semaglutide sodium or acetate, which the FDA says it isn’t aware of any lawful basis to compound.
Is compounded semaglutide with B12 the same medicine as plain compounded semaglutide?
No. Semaglutide with B12 is a different compounded formulation: the vial has vitamin B12 added, and your label should list it with its strength. Neither one is FDA-approved, and a licensed provider prescribes a compounded medication only when it offers a significant difference for you compared with an FDA-approved product.
Is semaglutide with B12 better than semaglutide alone?
Not on current evidence. A 2026 review found added ingredients in about half of compounded GLP-1 products, and limited evidence for adding vitamins without a documented deficiency. B12 turns the liquid red or pink, but it doesn’t change the semaglutide strength on your label. Neither version is FDA-approved.
Does adding B12 change the FDA’s rules for compounded semaglutide?
Not by itself. In the FDA’s example, a GLP-1 combined with B12 can still count as essentially a copy of an approved drug when both amounts are within 10% of approved strengths. Compounded semaglutide isn’t FDA-approved, with or without B12, and a provider prescribes it only if it offers a significant difference for you.
Does B12 change how many units of semaglutide you inject?
Not by itself. B12 changes the color, not the semaglutide strength on your label, and your units come from that strength in mg per mL. At 2.5 mg per mL, 10 units (0.1 mL) is 0.25 mg; at 5 mg per mL, the same 10 units is 0.5 mg. New strength? Ask before your next dose.
Important safety information
Compounded tirzepatide and semaglutide are not FDA-approved, and the FDA hasn’t reviewed them for safety, effectiveness or quality. A provider prescribes them only when they offer a significant difference for you compared with an FDA-approved product. Both medicines may cause thyroid tumors, including cancer: don’t use either if you or a family member has had medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia syndrome type 2 (MEN 2).
Read the full safety information
In studies with rodents, both medicines caused thyroid tumors; it isn’t known whether they cause them in people. Tell your provider 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 a faster heart rate. Tell your care team before any surgery or procedure that uses anesthesia or deep sedation. Don’t combine either medicine with other
Tirzepatide can make birth control pills less effective: switch to a non-oral method, or add a barrier method such as condoms, for 4 weeks after you start and for 4 weeks after each dose increase. Both medicines may harm an unborn baby. Semaglutide should be stopped at least 2 months before a planned pregnancy. Tell your provider right away 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 provider. You can report side effects to the FDA at
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“The U.S. Food and Drug Administration today approved a new higher dose (7.2 mg) of Wegovy (semaglutide) injection, called Wegovy HD, for weight loss and long-term maintenance of weight loss for certain adult patients.”
Who wrote and medically reviewed this page?
Leads the NexLife Medical Team, which writes and medically reviews NexLife’s guides, including this one.
Checked the FDA’s statement on semaglutide salt forms, the ingredients in compounded semaglutide, the 2026 review of compounded
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Compounded semaglutide at NexLife is $119 a month on a 12-month plan, or $139 month to month, at every dose, all in. A licensed provider decides if it’s right for you.
4.8 out of 5 on Trustpilot · Medical director Adam Kennah, MD (NPI 1144260043) · LegitScript-certified
Compounded medications aren’t FDA-approved. A provider prescribes one only when it offers a significant difference for you.
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Start online with your health history.
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Online, following your state’s rules. You’re prescribed only if treatment is right for you.
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Our partner pharmacy usually ships within 1 to 2 business days. Free shipping, and questions come to us 24/7, never to the pharmacy.
Sources
- U.S. Food and Drug Administration. FDA’s concerns with unapproved
GLP-1 drugs used for weight loss. - Annals of Pharmacotherapy. Belcourt J, Sapowadia A, White CM. Compounded semaglutide and tirzepatide products use unique formulations but efficacy and safety largely unknown (February 2026).
- U.S. Food and Drug Administration. FDA clarifies policies for compounders as national
GLP-1 supply begins to stabilize. - Novo Nordisk. Wegovy (semaglutide) prescribing information.
- Novo Nordisk. Ozempic (semaglutide) prescribing information.
- Drugs.com. Cyanocobalamin injection, USP: prescribing information.
- NexLife. Compounded semaglutide plans.
- Eli Lilly and Company. Zepbound (tirzepatide) prescribing information.
- LegitScript. LegitScript certification record for NexLife.us.
- NexLife. Compounded tirzepatide plans.
- Ro: weight loss program pricing. Checked November 1, 2026.
- Hims: Zepbound KwikPen. Checked November 1, 2026.
- Hims: Wegovy pill and pen, with membership. Checked November 1, 2026.
- Mochi Health: FAQs (membership and medication prices). Checked November 1, 2026.
- Embody: compounded tirzepatide, one-month supply. Checked November 1, 2026.
- Embody: compounded semaglutide, one-month supply. Checked November 1, 2026.