Vitamin B-Complex
A blend of B vitamins that act as coenzymes across carbohydrate, fat, and protein metabolism and in neurotransmitter synthesis.
Medically reviewed by Dr. Jonathan Snipes, MD. Last reviewed May 6, 2026.
What It Is
An injectable B-complex with thiamine (B1) 100mg, niacinamide (B3) 100mg, riboflavin-5-phosphate (B2) 2mg, and pyridoxine (B6) 2mg per mL. Self-administered intramuscular.
How It Works
Each B vitamin serves as a coenzyme: thiamine in carbohydrate metabolism, riboflavin in the electron transport chain, niacinamide in NAD and NADP pathways, and pyridoxine in amino acid and neurotransmitter metabolism. Injection delivers the full pool without relying on gut absorption.
Who It's For
Patients wanting broad B-vitamin support for energy, stress, and metabolic demand, including those on weight-loss protocols or with restricted diets.
Who Should Avoid It
Known allergy to any B vitamin. Use caution in renal impairment. Generally very well tolerated.
Protocol & Pricing
OBP Pharmacy Price
$40/30ml
You pay pharmacy price. No markup.
Starting Dose
1mL once weekly
Form
Injectable vial (30mL; thiamine 100mg, niacinamide 100mg, riboflavin-5-phosphate 2mg, pyridoxine 2mg per mL)
Dosing Protocol
1mL intramuscular once weekly, or per provider. Single 30mL vial ($40). Per mL: thiamine 100mg, niacinamide 100mg, riboflavin-5-phosphate 2mg, pyridoxine 2mg.
Beyond Use Date
90 Days from compounding (USP <797>)
Optimal Balance Pharmacy assigns this date and prints it on your vial label. Always follow the label. Once a multi-dose vial is punctured, the in-use date on the label is shorter than the compounding date shown here.
Stacking Guide
Stacks Well With
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From $35/10mlHow to get Vitamin B-Complex prescribed online
Vitamin B-Complex is available by prescription through a licensed telehealth visit and dispensed for human use by a named 503A pharmacy. That is what separates it from research-use-only vials sold without a prescription. There is no subscription and no membership, just a one-time visit fee.
- 1
Complete a $39 medical visit. Answer a short intake about your health history and your goals for Vitamin B-Complex. The $39 fee is the only charge RxPepsDirect collects, paid once, not a recurring subscription.
- 2
A licensed provider reviews it. A US-licensed nurse practitioner or physician reviews your intake and, if Vitamin B-Complex is appropriate for you, writes a patient-specific prescription. The starting dose is typically 1mL once weekly.
- 3
The pharmacy compounds and ships it. Optimal Balance Pharmacy, a 503A pharmacy in Texas, compounds Vitamin B-Complex and ships it pre-reconstituted by FedEx overnight in a reusable cooled case. Your fill is Injectable vial (30mL; thiamine 100mg, niacinamide 100mg, riboflavin-5-phosphate 2mg, pyridoxine 2mg per mL), and you pay the pharmacy $40/30ml at wholesale, with no clinic markup, plus a $15 flat FedEx overnight shipping fee charged by the pharmacy.
RxPepsDirect prescribes Vitamin B-Complex in the 29 jurisdictions its medical team is licensed in. Start a $39 visit or browse the full Vitamins & Injectables range. Comparing services first? See how RxPepsDirect stacks up against seven other providers in our best telehealth for compounded peptides comparison.
Common questions about Vitamin B-Complex
- What is Vitamin B-Complex?
- An injectable B-complex with thiamine (B1) 100mg, niacinamide (B3) 100mg, riboflavin-5-phosphate (B2) 2mg, and pyridoxine (B6) 2mg per mL. Self-administered intramuscular.
- How does Vitamin B-Complex work?
- Each B vitamin serves as a coenzyme: thiamine in carbohydrate metabolism, riboflavin in the electron transport chain, niacinamide in NAD and NADP pathways, and pyridoxine in amino acid and neurotransmitter metabolism. Injection delivers the full pool without relying on gut absorption.
- Who is Vitamin B-Complex for?
- Patients wanting broad B-vitamin support for energy, stress, and metabolic demand, including those on weight-loss protocols or with restricted diets.
- How much does Vitamin B-Complex cost?
- Vitamin B-Complex costs $40/30ml from Optimal Balance Pharmacy at wholesale, with a flat $39 medical visit fee from RxPepsDirect. The form is Injectable vial (30mL; thiamine 100mg, niacinamide 100mg, riboflavin-5-phosphate 2mg, pyridoxine 2mg per mL).
- What is the Beyond Use Date for Vitamin B-Complex?
- Optimal Balance Pharmacy assigns the Beyond Use Date for Vitamin B-Complex and prints it on the vial label. The listed figure is 90 Days from compounding (USP <797>). Always follow the date on your own label, and note that once a multi-dose vial is punctured, the in-use date on the label is shorter than the compounding BUD.