Weight Loss  /  Semaglutide + B12
For Adults · Compounded GLP-1

Semaglutide
+ B12

The proven weekly GLP-1, with vitamin B12 added.

A compounded weekly injection that pairs semaglutide — the clinically proven GLP-1 — with vitamin B12, commonly included to support energy and help ease nausea. Prescribed online, shipped from U.S. compounding pharmacies to all 50 states.

One flat price — the same at every dose

0.25 mg 0.5 mg 1 mg 1.7 mg 2.4 mg

$299/mo Every dose, one price

Start your online visit →

A few private questions, then a licensed provider reviews your answers.

Once Weekly B12 Added Compounded No Insurance
ForbiddenRx Semaglutide + B12
At a glance
Onset
Gradual, over weeks
Use
Once weekly
Form
Subcutaneous injection
Helps with
Appetite & weight
Class
Compounded GLP-1 + B12
For
Adults
The basics

What is Semaglutide + B12?

What it is
A compounded weekly GLP-1 injection
Base medication
Semaglutide — a GLP-1 receptor agonist
Added
Vitamin B12 (cobalamin)
Made by
U.S. 503A compounding pharmacy
B12 role
Energy support · nausea tolerance
Schedule
Once weekly, titrated gradually
Prescription
Provider-reviewed · no insurance required
Shipping
Discreet, unmarked · all 50 states
Start your online visit →

Semaglutide + B12 is a compounded weekly injection that combines semaglutide — a GLP-1 receptor agonist used for medically-supervised weight loss — with vitamin B12, prepared for each individual patient by a U.S. 503A compounding pharmacy. Because it combines ingredients, it is made per prescription rather than sold as a fixed off-the-shelf product.

Semaglutide is the part that drives the weight-loss effect: it mimics a natural gut hormone that curbs appetite and helps regulate blood sugar. The vitamin B12 is commonly added to support energy and to help some patients tolerate the nausea that can accompany a GLP-1, especially during the early titration weeks.

It is designed for one simple routine — a single subcutaneous injection on the same day each week, with the dose stepped up gradually. Your provider builds the titration plan around your body, your history, and your goals during your online visit.

Understanding the challenge

Why is losing weight so hard on willpower alone?

Because appetite is driven by biology, not just discipline — hunger hormones, blood-sugar swings, and a body that defends its set point all push back against dieting. GLP-1 medications like semaglutide work on that underlying biology: they mimic a gut hormone that signals fullness, slow how quickly the stomach empties, and steady blood sugar, so eating less feels natural instead of like a constant fight.

✔It is a medical condition, not a character flaw

Excess weight is influenced by genetics, hormones, medications, and metabolism. Treating it with a provider-supervised medication is a legitimate clinical approach, not a shortcut.

✔The B12 is there for the ride

Nausea and low energy are the most common early hurdles on a GLP-1. Vitamin B12 is commonly added to help support energy and ease that transition while the dose titrates up.

Know the difference

Compounded GLP-1 vs. diet & exercise vs. OTC supplements — what actually works?

The short answer: diet and exercise change your inputs, over-the-counter supplements make claims with little clinical backing, and a prescription GLP-1 works on the appetite biology itself — under the supervision of a licensed provider.

 Diet & exercise aloneOTC weight supplementsCompounded GLP-1 + B12 (Rx)
What it targetsCalories in / calories outVague "metabolism" claimsAppetite and blood-sugar biology
How you take itDaily habit changeDaily pills or powdersOne weekly injection
Clinical evidenceEffective but hard to sustainLittle to noneSemaglutide is a well-studied GLP-1
Provider involvedNoNoYes — reviews your health history first
Addresses hunger hormonesNoNoYes — that is the mechanism

Most people try diet and exercise first, find the weight comes back as hunger returns, and cycle through supplements that do little. A provider-supervised GLP-1 is the next step up: it works on the biology that makes eating less so hard to sustain.

How it works

How does semaglutide + B12 work?

It works by mimicking a natural gut hormone — curbing appetite, slowing digestion, and steadying blood sugar — while the added B12 supports energy and helps ease nausea during titration.

I

Semaglutide mimics GLP-1

The GLP-1 component mimics a natural gut hormone that signals fullness to your brain and helps regulate appetite.

II

Curbs appetite & steadies sugar

It slows stomach emptying and acts on appetite centers, so you feel satisfied sooner and blood sugar stays steadier.

III

B12 supports the ride

Vitamin B12 is commonly added to support energy and to help some patients with GLP-1-related nausea during titration.

Who it's for

Who is Semaglutide + B12 for?

It's for adults pursuing medically-supervised weight loss who want the proven weekly GLP-1 — and may benefit from added B12 for energy or nausea support.

✔Adults pursuing medically-supervised weight loss

You want a clinically proven GLP-1 with a provider guiding the plan, not a supplement or a fad.

✔People who want a simple weekly routine

One injection a week, on the same day — no daily pill to remember and no complicated regimen.

✔Those who felt nausea or low energy on a GLP-1

If a prior GLP-1 left you drained or queasy, the added B12 is commonly included to help support energy and tolerance.

✔Switching from another provider

Already on a GLP-1 and want to move your care and refills to ForbiddenRx — mention it in your visit.

✕When it's not the right fit

If you prefer the plain GLP-1 without the added B12, Semaglutide may fit better. And it's not appropriate for anyone with a personal or family history of medullary thyroid cancer or MEN2, a history of pancreatitis, or a known allergy to B12 — those need evaluation before starting. Share your full history in your visit.

How to get it

How do I get Semaglutide + B12 online?

You complete a private online visit, a licensed provider reviews it, and — if appropriate — your compounded medication ships to your door. No insurance required, no in-person appointment, no waiting room.

Complete your online visit

A few private questions about your health, weight, and goals, on your own time.

Provider review

A provider licensed in your state reviews your information and, if appropriate, writes a prescription and sets your titration schedule.

Discreet delivery

Shipped from a U.S. 503A pharmacy in plain, unmarked packaging to all 50 states. Automatic refills available, and you can message your care team anytime.

Pricing is shown at checkout — no insurance needed, no hidden fees.

Using it & safety

How do I use it, and is it safe?

You take one subcutaneous injection per week on the same day, with the dose stepped up gradually, and your provider sets the exact schedule for you. Most side effects are mild, gastrointestinal, and ease as your body adjusts.

How to use it

Schedule
One subcutaneous injection per week, on the same day each week.
Titration
Your dose steps up gradually over several weeks so your body can adjust.
Timing
Take it around the same time each week — with or without food.
Injection site
Rotate between the abdomen, thigh, or upper arm as your provider directs.
Storage
Follow the storage instructions on your prescription; keep it out of reach of children.
Support
Message your care team anytime — the added B12 may help with nausea, and further anti-nausea support is available if needed.
Weekly injectionTitratedProvider-set

Safety & side effects

⚠ Not right for everyone

Semaglutide + B12 is not for those with a personal or family history of medullary thyroid cancer (MTC) or MEN2, or a history of pancreatitis. Tell your provider about your full medical history, allergies (including to B12 or cobalamin), and every medication you take before starting.

Common side effects are usually mild and gastrointestinal, and often ease as your body adjusts. They may include:

  • Nausea
  • Reduced appetite
  • Constipation or diarrhea
  • Fatigue
  • Injection-site reactions

Start at the dose your provider sets and follow the titration schedule. Seek immediate care for severe or persistent abdominal pain (a possible sign of pancreatitis) or for any signs of an allergic reaction such as swelling or trouble breathing.

Compare your options

Which weight-loss option fits you?

A side-by-side look at the medically-supervised weight-loss options available through ForbiddenRx. Your provider helps you choose what's right.

TreatmentWhat it isFocusFormForRx required
Semaglutide + B12
Popular		A compounded weekly GLP-1 with vitamin B12Appetite & energy supportWeekly injectionAdultsYes
SemaglutideThe clinically proven weekly GLP-1Appetite & weightWeekly injectionAdultsYes
TirzepatideA dual GIP + GLP-1 agonistAppetite & weightWeekly injectionAdultsYes
Oral SemaglutideA daily GLP-1 tablet, no needlesAppetite & weightDaily tabletAdultsYes
Questions, answered

Semaglutide + B12 FAQ

Why is B12 added to semaglutide?

Vitamin B12 is commonly included in compounded semaglutide formulations to help support energy and to help some patients tolerate the nausea that can come with a GLP-1, especially during titration. The semaglutide is what drives appetite and blood-sugar effects.

Is this a compounded medication?

Yes. Because it combines semaglutide with B12, this formulation is prepared for the individual patient by a 503A compounding pharmacy under a valid prescription. Compounded preparations are not FDA-approved products.

How is it taken?

It's a once-weekly subcutaneous injection taken on the same day each week, with the dose titrated up gradually. Your provider sets the schedule.

Do I need a prescription?

Yes. After your online visit, a licensed provider reviews your information. A prescription is not guaranteed and is subject to provider review of your health history.

Who should not take it?

It's not appropriate for people with a personal or family history of medullary thyroid cancer (MTC) or MEN2, or a history of pancreatitis, among other conditions — or anyone with a known allergy to B12 (cobalamin). Share your full medical history with your provider.

Is my visit private?

Yes. Your consultation is confidential and medication ships in discreet, unmarked packaging. Your information is handled in accordance with applicable privacy standards.

Credibility you can verify

Care held to a higher standard

Licensed Providers

U.S. board-certified clinicians

503A Pharmacies

U.S.-based compounding partners

All 50 States

Nationwide telehealth coverage

Explore more

Related weight-loss options

GLP-1 · Weekly

Semaglutide

The clinically proven weekly GLP-1 injection for medically-supervised weight loss, without the added B12.

Learn more →
Dual agonist · Weekly

Tirzepatide

A dual GIP + GLP-1 agonist — a once-weekly injection for weight management.

Learn more →
Category

Weight Loss

Compare every medically-supervised weight-loss option available through ForbiddenRx.

Browse treatments →

Ready when you are

Complete a quick online visit. A licensed provider reviews your information and, if appropriate, your semaglutide + B12 ships to your door.

Start your online visit →

  • Discreet, unmarked packaging
  • Automatic refills
  • Message your care team anytime
  • Licensed providers in all 50 states
Medically reviewed

Sources & references

Medically reviewed by ForbiddenRx Medical Affairs — Independent, licensed medical providers · Last reviewed July 2026. This page was written and is periodically reviewed for medical accuracy in line with clinical guidance followed by the independent, licensed medical providers in the ForbiddenRx network. It is provided for general educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always talk with a licensed provider about your individual health.

  1. U.S. Food & Drug Administration. Compounding and the FDA: Questions and Answers.
  2. U.S. Food & Drug Administration. Drugs@FDA: FDA-Approved Drugs (semaglutide labeling).
  3. MedlinePlus. Semaglutide Injection — Drug Information.
  4. U.S. Pharmacopeia (USP). General Chapter <797> Pharmaceutical Compounding — Sterile Preparations.
For further reading

Clinical references

This page is educational and is not medical advice.