Doctor's Best Fully Active B Complex with Quatrefolic delivers energy support through a potent blend of eight essential B vitamins in bioavailable forms. Quatrefolic folate gives the bioactive 5-MTHF form, helping with DNA and neurotransmitter synthesis and keeping daily energy supported. This brand stands by science-based nutrition and quality, using clear ingredients and vegan, non-GMO formulations to back your wellbeing. This product can complement a vitamin d supplement routine for overall wellness.

Available Sizes & Variants:

30 veggie capsules - convenient daily dose in a plant based capsule.

Benefits & Features:

• Boosts daily energy naturally.
• High bioavailability of the essential B vitamins means better absorption and steady energy across the day, helping you stay focused during tasks and combat fatigue in busy schedules.
• Quatrefolic folate delivers the bioactive form for consistent folate support day to day.
• Non-GMO, gluten free, soy free and vegan ingredients appeal to ethical diets.
• Once daily dosing fits into routines for steady, convenient nutrient support.

Quatrefolic, developed by Gnosis S.p.A., delivers the bioactive form for consistent folate support day to day. Doctor's Best backs this with science-based nutrition, transparent labelling, and vegan, non-GMO ingredients, reflecting a modern approach to everyday wellness. The simple once daily capsule fits into busy routines, helping you maintain energy, focus and overall wellbeing. For expectant mothers, our vitamin b12 supplements option can be considered alongside prenatal vitamins as part of a balanced plan.

Other Ingredients - Hypromellose (vegetarian capsule), micro crystalline cellulose, magnesium stearate (vegetable source), silicon dioxide.
Free From - Gluten Free, Soy Free

• GTIN: 753950002999
• 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.

Take one capsule each 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 is a water-soluble vitamin essential for normal metabolic function and energy production.

This form is methylcobalamin, a bioavailable version of B12, used in this complex alongside other bioactive B vitamins to support cellular metabolism.

What Does Vitamin B12 Do?

Vitamin B12 contributes to normal energy-yielding metabolism and supports the normal function of the nervous system, in line with EFSA guidance. It also aids in the normal metabolism of homocysteine.

As a cofactor in mitochondrial energy production, B12 participates in essential enzymatic steps to support everyday vitality.

This product 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.

This brand’s science-led approach and established reputation set the standard for high-quality B‑vitamin nutrition. Doctor’s Best is recognised for formulating with advanced ingredients like Quatrefolic, a highly soluble bioactive folate, which aligns with our aim to offer optimised nutrient bioavailability and traceability in critical components.

Welzo’s medical team evaluated Doctor’s Best through our rigorous vetting process, considering formulation strength, transparency of ingredient sourcing, and a commitment to non‑GMO, gluten‑free, soy‑free and vegan statements. This is reinforced by the brand’s emphasis on “Science‑Based Nutrition” and modern, high‑potency B‑vitamin combinations that support the intended daily value targets in a single capsule.

We selected Doctor’s Best because their focus on bioavailable forms and branded ingredients differentiates them from competitors, offering consistency, traceability and a clear quality narrative. This aligns perfectly with this product’s needs and our standards, ensuring reliability for customers seeking an active, well‑rounded B‑complex supplement. This brand was evaluated by Welzo's healthcare professionals for compliance with our ingredient quality and purity standards.