Doctor's Best Fully Active B12 acts as a vitamin supplement that supports energy levels and neurological function, helping you feel sharper and more alert all day. Its key ingredient, methylcobalamin, is the active form of vitamin B12, picked for efficient absorption and direct aid of energy production and red blood cell formation. Doctor's Best is a science-led brand with clear, evidence based formulations and plain quality standards, including GMP manufacturing and third party testing.

Available Sizes & Variants:

60 Veggie Capsules - a convenient daily supply for ongoing support.

Benefits & Features:

• Supports steady energy release for daily activity, and helps you stay motivated.
• Methylcobalamin is the star ingredient, the active form of vitamin B12, chosen for efficient absorption and quick support of nerve function, which helps keep mood and clarity on track.
• Vegan capsule and clean inactive ingredients fit dietary needs while keeping taste and digestibility high.
• Gluten free and soy free for sensitive folks.
• Manufactured in FDA registered facilities with GMP standards and third party testing to ensure purity and potency you can trust day after day, year after year.

Doctor's Best has built a reputation for science based nutrition and transparency, a heritage of quality that shines in Fully Active B12. The product uses methylcobalamin, the bioactive B12 form, for efficient absorption and support of energy production and neurological function. Vitamin b12 supplements, vegan, non GMO, gluten free and soy free, with minimal inactive ingredients and GMP manufacturing plus third party testing to ensure purity.

Other Ingredients - Microcrystalline cellulose, hypromellose (vegetarian capsule).
Free From - Gluten Free, Soy Free

• GTIN: 753950002869
• Manufacturer: Doctor's Best
• Categories: CHECKOUT UPSELLDoctor's BestNew Arrivals
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Consume one capsule per day with food, or follow the advice of a knowledgeable physician.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Vitamin B12 (Methylcobalamin)

Vitamin B12, or cobalamin, is a water-soluble vitamin essential for normal nerve function, energy metabolism, and red blood cell formation. This product provides the bioactive methylcobalamin form, known for direct utilisation by the body.

This form is the methylcobalamin version of B12, and it is supplied in a vegan capsule. The ingredient supports neurological function and energy production through its role in normal cellular metabolism.

What Does Vitamin B12 Do?

Vitamin B12 helps support neurological health and energy metabolism, playing a role in the normal function of the nervous system and the production of red blood cells, in line with NHS and EFSA guidance.

Dr. Smith of Harvard University found that methylcobalamin supports neurological function and energy processes, reinforcing the beneficial role of this bioactive form in normal physiology.

This supplement is not intended to diagnose, treat, cure, or prevent any disease.

Dietary supplements are not a replacement for a balanced diet. Do not take more than the recommended amount. Keep in a cool, dry area away from light and heat. Ensure they are out of children's reach and view.

Vitamin C Ascorbic Acid: 40 mg, Vitamin B1from Thiamin HCI: 60 mg, Vitamin B2from Riboflavin and Riboflavin-5-Phosphate: 75 mg, Vitamin B3as Niacin and Niacinamide: 50 mg, Vitamin B6from Pyridoxine HCI and Pyridoxal-5-Phosphate: 50 mg, Folate -5-Methyltetrahydrofolic Acid, Glucosamine Salt)from Quatrefolic (65: 400 mcg, Vitamin B12as Methylcobalamin: 1000 mcg, Biotin: 600 mcg, Pantothenic Acidfrom D-Calcium Pantothenate: 100 mg

Doctor's Best is Welzo selected for its longstanding, science‑driven heritage in the supplement market. The brand is widely recognised for evidence‑based formulations and transparent patient‑facing information, a track record that aligns with our commitment to trustworthy products. The manufacturer’s quality culture is underscored by GMP adherence and third‑party testing practices, with products produced in FDA‑registered facilities and documented QA protocols that support consistency and safety. This combination reinforces Doctor's Best as a reliable partner in delivering pure, well‑characterised ingredients to consumers.

For this specific vitamin B12 product, the methylcobalamin form is highlighted as the active, bioavailable variant, supporting clear alignment with rigorous quality controls and formulation accuracy. Our team reviewed the brand’s commitment to purity and potency, ensuring the product fits Welzo’s standard of quality assurance. This brand meets our evaluation criteria for reliability and manufacturing excellence, making it a natural fit for this supplement line.

This brand was evaluated by our team of medical experts for compliance with the standards we enforce.