BioActive Complete B-Complex drives energy use and nervous system wellbeing, helping you feel more energised, focused, and resilient everyday. Its main aim is to deliver bioactive B vitamins in easily absorbed forms to support energy use and brain function. Built on Life Extension's years of supplement science, this range blends trusted quality with modern, research based formulation.

Available Sizes & Variants:

60 Veggie Caps - daily support for energy and nervous system health.

Benefits & Features:

• Boosts daily energy for busy, demanding days.
• Active forms, including 5-MTHF and methylcobalamin, improve absorption for better energy and mood support.
• Backed by Life Extension's years of supplement science, BioActive Complete B-Complex uses pharmaceutical-grade ingredients and a comprehensive blend to help meet daily nutrient needs while supporting cognitive function and red blood cell production.
• Designed in veggie capsules for easy swallowing and vegetarian friendly nutrition.
• Ideal for daily use as part of a balanced diet, helping fill nutrient gaps and support energy, brain function, and overall wellbeing.

BioActive Complete B-Complex draws on active forms like 5-MTHF, methylcobalamin, riboflavin 5’-phosphate, and pyridoxal 5’-phosphate to maximise absorption. Life Extension has built a reputation for science led, high quality ingredients over decades, and this formula mirrors that commitment. The vegetarian capsules suit vegan lifestyles, while the blend supports energy metabolism and nervous system health in a convenient daily routine. Thoughtful sourcing and a transparent, research informed approach set it apart in a crowded market. While not a vitamin d supplement itself, it sits well with probiotics in well rounded routines, and it stands out as a true b complex multivitamin.

Thiamine (vitamin B1) (as thiamine HCl)
Riboflavin (vitamin B2) (as riboflavin and riboflavin 5’-phosphate)
Niacin (vitamin B3) (as nicotinamide and nicotinic acid)
Vitamin B6 (as pyridoxine HCl and pyridoxal 5’-phosphate)
Folate (vitamin B9) (as L-5-methyltetrahydrofate calcium salt)
Vitamin B12 (as methylcobalamin)
Biotin (vitamin B8)
Pantothenic acid (vitamin B5) (as D-calcium pantothenate)
Inositol
PABA (para-aminobenzoic acid)

• GTIN: 737870194569
• Manufacturer: Life Extension
• Categories: Best SellersLife ExtensionNew ArrivalsSubscribe & Save Products
• 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 two capsules daily with food, or as advised by your healthcare provider. Mix 8 grams (approx. 1 tablespoon) in 8 ounces of water per day\, or as directed by your health care physician.

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

The Active Ingredient Is: Vitamin B12 (Methylcobalamin)

Vitamin B12, (also known as) methylcobalamin, is a (crucial) water-soluble vitamin involved in normal nervous system function and (energy metabolism).

This form is the biologically active methylcobalamin, (often) used to support nerve function and red blood cell production within a (full) B vitamin profile.

What Does Vitamin B12 Do?

Vitamin B12 (contributes) to normal nervous system function and energy production, (backing) metabolic processes as described in EFSA and NHS guidance.

It also (helps) regulate homocysteine levels and (supports) DNA synthesis and (neurological) function, contributing to (everyday) nervous system health in line with (established) health authority recommendations.

This product is not (meant) to diagnose, treat, cure, or prevent any disease.

Life Extension takes a consistently science-led approach to nutrition, emphasising pharmaceutical-grade ingredients and research-backed dosages in BioActive Complete B-Complex. This brand prioritises high-quality formulation choices, including bioactive vitamins such as 5-MTHF and methylcobalamin, which aligns with our emphasis on active, readily utilisable forms for better potential utilisation. The manufacturer’s well-established reputation in the industry mirrors a long-standing heritage in evidence-based supplement design, shielding our confidence in their product development philosophy. For our team, the clear focus on rigorous formulation standards translates into a strong edge in an increasingly active market for B vitamins.

This brand stands out through its consistent commitment to quality and scientific rigour, which is reflected in their use of well recognised active ingredients and research-informed dosages. Our selection decision was guided by a careful evaluation of brand credibility, product integrity and manufacturing philosophy, reinforced by our team of medical experts and the standards we enforce with the standards we enforce. We chose Life Extension as our partner for this essential B-complex formulation because of their disciplined, evidence-based approach to supplement design.