It runs the energy line
B12 is a cofactor in the reactions that turn food into usable cellular energy. Run short and that line slows, and the tiredness is real rather than imagined.
Methylcobalamin B125 mg/mL injection, 10 mL vial
$39 $19.50 50% off
first mo.as low as · choose 3 or 12 months
Low energy and brain fog?
Prescription methylcobalamin B12 · 5 mg/mL
As low as $39 $19.50 50% off for the first month
Choose 3 or 12 months
Daycare pickup is easier.
Verified B12 customer
Free shippingNothing on the box
No consult feeProvider review included
FSA and HSABenefits cards accepted
Prescription, not a shelf bottle
A shelf bottle cannot read your last B12 result.
A licensed U.S. provider reads your fatigue pattern, your diet, your medication list, and any prior B12 result, then writes your dose on your label. A licensed 503A compounding pharmacy in the United States compounds the vial against that prescription, which is why your name, your active, and your strength are printed on it.
Get started nowWhat B12 does in your body
Crush Fatigue, Stay Sharp, Stay Focused
It builds red blood cells
Normal red blood cell formation and DNA synthesis both depend on B12. Those cells carry the oxygen behind a flight of stairs and a long ride alike.
It insulates your nerves
B12 maintains the myelin around nerve cells and normal neurological function, which shows up as steady thinking instead of fog.
Your body makes none of it
Every molecule of B12 you carry arrived through your diet or a dose. Vegetarian eating, gastric surgery, gut conditions, and some long-term medications all change how much of it you take up.
Roles described in the NIH Office of Dietary Supplements Vitamin B12 Fact Sheet for Health Professionals.
What arrives
90 days of B12 in one vial.
One 10 mL vial, with directions and dosing on your pharmacy label. No delivery charge bolted on at checkout.
- Prescription methylcobalamin B12
- Directions on your label
- A licensed provider on your case
- Messaging with your care team
- Free shipping. Every box ships free, in plain packaging with nothing on the outside.
- No separate consult fee. The online provider review is inside the package price.
- Refunded if it is declined. If a provider does not prescribe B12 for you, you get your money back.
- FSA and HSA cards accepted. Pay with your benefits card at checkout, the same as any other card.
- Pause or cancel any time. Change or stop your plan before the next shipment bills.
- Form
- Methylcobalamin injection
- Strength
- 5 mg/mL
- Dose
- Set by your clinician
- Supply
- 90 days, one 10 mL vial
As low as $39 $19.50 50% off for the first month · Choose 3 or 12 months
Medication, provider review, care messaging, and shipping are inside that number.
Verified customer reviews
What B12 customers say.
Daycare pickup is easier
“My B12 was low and I felt terrible every afternoon by the time I picked up my daughter. Four weeks into the shots, I am getting through work and daycare pickup without crashing on the couch. My Rebody clinician explained the lab results clearly, and the shipment included all the supplies.”
More energy after work
“My labs showed low B12 and the clinician recommended weekly shots. After a few weeks I have more energy after work and am not going directly to the couch every day. Rebody included everything I needed with the first shipment.”
Running again
“I eat mostly plant based, so low B12 was not a surprise. What surprised me was how much better I felt after starting the injections. Seven weeks in, I am running before work a few times a week instead of turning around after the first mile.”
How Rebody works
Live a Healthier and Longer Life
One online visit, one licensed provider, and one shipment that covers 90 days.
- 01
Tell us about your afternoons
A few minutes online about your fatigue, diet, medications, health history, and any prior B12 result.
- 02
A licensed provider reads it
A U.S. provider sets your dose and your directions. No waiting room and no referral.
- 03
A licensed pharmacy fills it
A U.S. compounding pharmacy prepares your 10 mL vial.
- 04
Three months land on your doorstep
Your vial ships free in discreet packaging, with directions and dosing on the pharmacy label.
B12 injections
Common questions, direct answers.
The form, the strength, the dose, the supply, the price, and what a provider decides before any of it ships.
What exactly am I prescribed?
Methylcobalamin 5 mg/mL in a 10 mL vial, compounded by a licensed 503A compounding pharmacy in the United States. Methylcobalamin is a biologically active form of vitamin B12. The active ingredient, the strength, and the vial size are printed on your label.
How often do I inject it?
Your clinician sets the injection dose and schedule. Follow your prescription label. Your prescriber sets your final dose and directions from your health history and your label carries them, so message your care team before you change your schedule.
Why an injection rather than a tablet?
An injection puts the dose into the tissue instead of running it through your stomach and small intestine. That matters when diet, a gut condition, or a long-term medication is part of why your B12 is low. Your provider reviews those factors before prescribing.
Will B12 do anything if my level is already normal?
Extra B12 is not a general stimulant once your B12 status is adequate. Low B12 causes real hematologic and neurologic problems, and fatigue is a useful signal in context, but fatigue on its own does not identify a shortfall. Your level, your diet, your medications, and your absorption decide it, which is what the provider review is for.
What does the price cover?
The online provider review, prescription methylcobalamin B12 when it is prescribed, messaging with your care team, and free discreet shipping. The shipment carries 90 days of treatment. After that it renews at the regular rate on the same cadence, and you can pause or cancel before it bills.
Can I pay with an FSA or HSA card?
Yes. Rebody accepts FSA and HSA cards at checkout. If your card is declined at the bank, pay another way and send the receipt to your plan administrator.
What happens if a provider does not prescribe B12 for me?
You get your money back. A declined prescription request receives a full refund to your original payment method, and nothing ships.
Do I need a prescription, a referral, or a lab result first?
A prescription, yes. A referral, no. Share any prior B12 result in your visit. Serum B12 is the usual first test and methylmalonic acid is a more sensitive marker when a serum result is borderline, and your provider decides what your case needs. A licensed U.S. compounding pharmacy fills and ships the medication only when it is prescribed.
Safety and prescribing
Your complete health history matters.
Tell your provider about every medication and supplement you take, your allergies, any prior B12 result, and your complete health history. Injection-site pain, redness, itching, or swelling can occur.
Seek urgent care for signs of a serious allergic reaction, including trouble breathing, facial swelling, severe dizziness, or fainting. Do not share your vial or your injection supplies with anyone.
Compounded medications are not FDA-approved or evaluated for safety, efficacy, or quality by the FDA. Prescription required. Not available in all states. Results vary.Methylcobalamin B12 at home
Prescription B12, delivered free.
Choose 3 or 12 months FSA and HSA cards accepted. Full refund if a provider does not prescribe.