How B12 Supports Your GLP-1 Treatment
1. Reduces Nausea and GI Side Effects
Nausea is the most common side effect of GLP-1 medications, especially during the first few weeks or after dose increases. B12 has been shown to support digestive function and may help reduce the severity of nausea, stomach discomfort, and GI upset that many patients experience when starting treatment.
2. Protects Against Nutrient Deficiency
GLP-1 medications work by slowing gastric emptying and reducing appetite. This means you're eating less, which is the goal, but eating less also means absorbing fewer nutrients.
B12 deficiency is a real risk when caloric intake drops significantly. Symptoms of B12 deficiency include:
Fatigue and weakness
Brain fog and difficulty concentrating
Numbness or tingling in hands and feet
Mood changes and irritability
Dizziness
By including B12 directly in your injection, we proactively prevent deficiency before it starts.
3. Sustains Energy Levels During Weight Loss
Caloric restriction often leads to fatigue, especially in the first few weeks. B12 plays a critical role in converting food into cellular energy. Patients who maintain adequate B12 levels report more consistent energy throughout the day, less afternoon fatigue, better workout performance, and improved motivation to stay active.
4. Supports Metabolism
B12 is essential for healthy metabolic function. It helps your body metabolize fats and proteins efficiently, which is exactly what you want when you're losing weight. Without adequate B12, your metabolism can slow, making weight loss harder.
5. Protects Neurological Health
Long-term B12 deficiency can cause neurological issues, including nerve damage. Because GLP-1 treatment is often ongoing, we include B12 to protect your nervous system over the course of your treatment.
6. One Injection, Maximum Benefit
Combining B12 with your GLP-1 means one weekly injection instead of two. Less hassle, better compliance, and you're not juggling multiple treatments.
B12 Benefits at a Glance
Benefit | How It Helps |
Reduces nausea | Supports GI function during the adjustment period |
Prevents deficiency | Protects against low nutrient intake from reduced appetite |
Maintains energy | Converts food to cellular fuel so you stay active |
Supports metabolism | Helps your body process fats and proteins efficiently |
Protects nerves | Prevents long-term neurological issues from B12 depletion |
Simplifies treatment | One shot per week, not two |
Can I Get My GLP-1 Without B12?
We're often asked if we offer a GLP-1-only option. Due to compounding requirements, B12 cannot be fully removed from your GLP-1 formulation. The medication requires an additive for stability and safety.
However, if you prefer not to have B12, you can request a glycine substitution. Glycine is an amino acid that replaces B12 as the secondary compound in your formulation.
How the Substitution Works
| B12 (Default) | Glycine (By Request) |
Included by default | Yes | No |
How to request | No action needed | Contact support |
Nausea support | Yes | No |
Energy support | Yes | No |
Nutrient protection | Yes | No |
Medication stability | Yes | Yes |
Additional cost | None | None |
Important Things to Know About the Glycine Substitution
B12 can be substituted for glycine only. The GLP-1 compound cannot be formulated without either B12 or glycine. One must be present.
The substitution is available by request through our support team. Message us through chat or your Patient Portal at my.goodgirlrx.com.
Your provider will be notified of the change.
If you switch to glycine and later want B12 back, just let us know.
Why We Recommend Keeping B12
We strongly recommend keeping B12 in your formulation. Here's why:
Patient safety — Reduced food intake increases deficiency risk. B12 protects against this.
Better tolerability — B12 helps reduce nausea and GI discomfort.
Clinical outcomes — Patients with adequate B12 report better energy and sustained weight loss.
Simplicity — One injection handles both your GLP-1 and B12 needs.
No added cost — B12 is included in your plan price. You're not paying extra.
Our providers and pharmacy partners designed this formulation based on real-world patient outcomes. The combination simply works better than GLP-1 alone.
What If I Already Take B12 Supplements?
That's fine. B12 is a water-soluble vitamin, which means your body excretes any excess through urine. You cannot "overdose" on B12 from having it in your injection while also taking an oral supplement.
That said, you likely won't need an additional B12 supplement while on treatment. The injection provides a highly bioavailable dose that's more effective than oral supplements anyway.
Injection vs. Oral B12: Why Injection Wins
Factor | Oral B12 | Injected B12 |
Absorption rate | ~1-2% (requires intrinsic factor) | ~100% (bypasses digestion) |
Effectiveness | Variable, depends on gut health | Consistent and reliable |
Convenience | Daily pill required | Already in your weekly GLP-1 shot |
Speed | Weeks to build levels | Immediate availability |
When B12 is injected, it goes directly into your muscle tissue and bloodstream. No absorption issues, no dependency on digestive function.
How Much B12 Is in My Injection?
Our compounded GLP-1 formulations contain a therapeutically effective dose of B12 (cyanocobalamin). The exact amount is calibrated by our independent, state-licensed compounding pharmacy partners to provide meaningful benefit without unnecessary excess.
Why Is My Injection Red or Pink?
If your GLP-1 injection has a red or pinkish tint, that's completely normal. Vitamin B12 (cyanocobalamin) is naturally a deep red color. It's actually one of the few vitamins with a visible color. When B12 is combined with your GLP-1 medication during compounding, it gives the solution its reddish appearance.
What the Color Does NOT Mean
The medication is contaminated
Something was mixed incorrectly
The vial has gone bad
The color is simply B12 doing its job. If you've ever seen a standalone B12 injection, you'll notice it's the same red. A clear or colorless GLP-1 injection would actually indicate that B12 is not included in the formulation.
If your medication ever appears cloudy, has visible particles, or looks significantly different from your previous vials, do not use it and message your provider through your Patient Portal at my.goodgirlrx.com.
Will I Feel the B12 Working?
Many patients report feeling more energetic within the first 1-2 weeks of treatment. Some notice clearer thinking, better mood, more motivation to exercise, and less fatigue despite eating less.
Results vary by individual, but the B12 component is working in the background whether you "feel" it or not.
Is This the Same as a "Skinny Shot" or "Lipo Shot"?
No. "Skinny shots" or "lipotropic injections" typically contain B12 plus other compounds like MIC (Methionine, Inositol, Choline). Our GLP-1 + B12 formulation is different:
GLP-1 is the active weight loss medication (Semaglutide or Tirzepatide)
B12 is included for tolerability and nutritional support
If you're interested in lipotropic injections as a complement to your GLP-1 treatment, we offer those separately: Start your Lipo + B12 visit
Quick Reference
Question | Answer |
Is B12 included by default? | Yes, in all GLP-1 formulations |
Can B12 be fully removed? | No. An additive is required for compounding stability. |
Can B12 be swapped for something else? | Yes. Glycine can be substituted by request. |
How do I request the swap? | Contact support via chat or your Patient Portal |
Is there an extra cost? | No. Both options are included in your plan price. |
Can I switch back to B12 later? | Yes, just let us know |
Why is my injection red/pink? | That's the natural color of B12. Completely normal. |
Can I take oral B12 too? | Yes. B12 is water-soluble and excess is safely excreted. |
Still Have Questions?
Patient Portal: my.goodgirlrx.com Help Center: help.goodgirlrx.com
Message your provider through the portal if you have specific questions about your formulation.
💕 The GoodGirlRx Team