Integrative Therapeutics B Complex | Active B-Complex Guide

Name: Active B-Complex
Brand: Integrative Therapeutics
SKU: IT-10032
Price: 18.25 USD
Availability: InStock

Explore Integrative Therapeutics B Complex (Active B-Complex) with all 8 B-vitamins in active forms for energy, methylation, and nervous system support.

Overview

What Is Integrative Therapeutics B Complex?

Active B-Complex from Integrative Therapeutics is a comprehensive, high-potency formula delivering all eight essential B-vitamins along with Choline. Designed to support energy production, methylation, and nervous system health, this integrative therapeutics b complex provides the active, bioavailable forms of key B-vitamins — including riboflavin-5'-phosphate (active B2), pyridoxal-5-phosphate (active B6), methylcobalamin (active B12), and Quatrefolic® methylfolate — so the body can put them to work without requiring additional conversion steps.

B-vitamins are water-soluble nutrients that play essential roles in cell function, growth, and energy production. They help the body metabolize carbohydrates, proteins, and fats — effectively converting food into fuel. They also support the nervous system's synthesis of neurotransmitters such as serotonin, dopamine, and GABA, promoting brain and nervous system health.

Active B-Complex is gluten-free and vegan. It is free from wheat, soy, dairy, artificial colors, and flavors. Each bottle provides 60 capsules with a serving size of 1 capsule.

How It Works

Energy, Methylation, and Nervous System Support

The integrative therapeutics b complex formula is built around three interconnected pillars of B-vitamin function: energy production, methylation support, and nervous system health.

Energy Production

B-vitamins serve as cofactors and coenzymes for the metabolic pathways that convert carbohydrates, proteins, and fats into cellular energy (ATP). Thiamin is essential for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase — key enzymes in glucose metabolism. Riboflavin is the precursor to FAD and FMN, which are critical electron carriers in the mitochondrial respiratory chain. Niacin is the precursor to NAD+ and NADP+, coenzymes involved in over 500 enzymatic reactions including glycolysis and oxidative phosphorylation. Pantothenic acid is the precursor to Coenzyme A, required for the TCA cycle and fatty acid metabolism.

Methylation Support

Methylation is a fundamental biochemical process involved in DNA repair, neurotransmitter synthesis, and homocysteine metabolism. This formula provides methylfolate (Quatrefolic®) for immediate bioavailability in the one-carbon pathway, riboflavin to support MTHFR enzyme activity, Vitamin B6 for the transsulfuration pathway, and methylcobalamin as a cofactor for methionine synthase — collectively helping to maintain healthy homocysteine levels and SAMe production.

Nervous System Health

B-vitamins are classified as neurotropic vitamins. Vitamin B6 is a cofactor for the synthesis of serotonin, dopamine, GABA, and norepinephrine. Vitamin B12 is critical for myelin synthesis and neuronal maintenance. Folate supports neurotransmitter synthesis and homocysteine clearance in the nervous system. Thiamin is essential for neurological function, and its deficiency causes well-characterized nervous system disorders.

What's inside

Key ingredients

Thiamin — 50 mg

Vitamin B1 (thiamin) is an essential cofactor for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase — key enzymes that couple glycolysis to the TCA cycle and enable mitochondrial ATP production from glucose. Research supports its critical role in energy-yielding metabolism, and European regulatory authorities have authorized a health claim that B1 contributes to normal energy-yielding metabolism. Thiamin is also essential for the proper functioning of the central and peripheral nervous system, where it is involved in neurotransmitter synthesis — including acetylcholine, GABA, and glutamate. Deficiency causes profound cellular energy failure and severe neurological disorders including beriberi and Wernicke's encephalopathy.

Riboflavin — 50 mg

Vitamin B2 (riboflavin) is the precursor to FAD and FMN, coenzymes that are essential for the mitochondrial electron transport chain, beta-oxidation of fatty acids, and TCA cycle function. FAD directly accepts electrons at Complex II of the electron transport chain, making riboflavin indispensable for cellular ATP production. As an obligate coenzyme (as FAD) for MTHFR, riboflavin supports the conversion of 5,10-methyleneTHF to 5-MTHF, directly supporting methylation and healthy homocysteine metabolism — research shows riboflavin supplementation specifically lowers homocysteine in individuals homozygous for the MTHFR 677C>T polymorphism. Riboflavin also supports nervous system function; riboflavin transporter deficiency causes severe progressive neuropathy that responds to supplementation, and a 2025 systematic review identifies riboflavin as a multifaceted therapeutic agent in neurology.

Niacin — 100 mg

Vitamin B3 (niacin) is the precursor to NAD+ and NADP+, coenzymes essential for over 500 enzymatic reactions including glycolysis, the TCA cycle, and oxidative phosphorylation. Studies have shown that supplementation in mitochondrial disease can raise cellular NAD concentrations up to 24-fold and enhance Complex I substrate availability for ATP production. EFSA authorizes the health claim that niacin contributes to normal energy-yielding metabolism. Niacin is also essential for NAD+ synthesis critical for neuronal energy metabolism, DNA repair, and neuron survival. Severe deficiency (pellagra) causes neurological manifestations including confusion and dementia. Additionally, niacin spares tryptophan from the kynurenine pathway, preserving its availability for serotonin synthesis.

Vitamin B6 — 50 mg

Vitamin B6, provided as pyridoxal-5-phosphate (PLP, the active coenzyme form), is a cofactor for over 100 enzymatic reactions. It is essential for the biosynthesis of multiple neurotransmitters, including serotonin, dopamine, GABA, and norepinephrine — supporting brain health and mood. Studies confirm its role in the transsulfuration pathway, converting homocysteine to cystathionine, which supports methylation and healthy homocysteine clearance. PLP is also required for glycogen phosphorylase (critical for muscle energy mobilization), amino acid metabolism, hemoglobin formation, and immune function. EFSA authorizes health claims for B6 contributing to normal energy-yielding metabolism, reduction of tiredness and fatigue, and normal psychological function.

Folate — 800 mcg

Folate (vitamin B9), provided as Quatrefolic® methylfolate for immediate bioavailability, is an indispensable cofactor in one-carbon metabolism. It supports the biosynthesis of purines, thymidylate, and S-adenosylmethionine (SAMe) — processes critical for DNA replication, repair, and cellular proliferation. As 5-methyltetrahydrofolate, it donates a methyl group to convert homocysteine to methionine; numerous RCTs confirm folate supplementation significantly reduces plasma homocysteine. Folate is essential for nervous system development and maintenance, supporting neurotransmitter synthesis and homocysteine clearance. Deficiency causes megaloblastic anemia and fatigue due to impaired red blood cell production. EFSA recognizes that folate contributes to normal blood formation and the reduction of tiredness and fatigue.

Vitamin B12 — 1000 mcg

Vitamin B12, provided as methylcobalamin (the active coenzyme form), is required for methionine synthase — the enzyme that remethylates homocysteine to methionine using 5-methyltetrahydrofolate, directly sustaining the SAMe/methylation cycle. B12 deficiency stalls this reaction, trapping folate and elevating homocysteine. Studies confirm B12 supplementation lowers homocysteine by approximately 7% as a standalone effect, with greater reductions in combination with folate and B6. Vitamin B12 is essential for myelin synthesis, neuronal maintenance, and DNA synthesis. Deficiency causes megaloblastic anemia and severe fatigue; correction of B12 deficiency consistently restores energy. It is also critical for nervous system health — deficiency can cause subacute combined degeneration of the spinal cord, peripheral neuropathy, and cognitive changes.

Biotin — 300 mcg

Vitamin B7 (biotin) is an essential coenzyme for five carboxylase enzymes that catalyze critical steps in the metabolism of fatty acids, glucose, and amino acids — including gluconeogenesis, fatty acid synthesis and oxidation, and branched-chain amino acid catabolism. EFSA authorizes the health claim that biotin contributes to normal energy-yielding metabolism. It also serves as a cofactor for mitochondrial carboxylase enzymes including pyruvate carboxylase (TCA cycle anaplerosis) and propionyl-CoA carboxylase, which are localized in the mitochondrial matrix and essential for mitochondrial metabolic flux. Deficiency, while uncommon in balanced diets, impairs energy metabolism and causes fatigue.

Pantothenic Acid — 100 mg

Vitamin B5 (pantothenic acid) is the essential precursor to Coenzyme A (CoA), which is required for the metabolism of carbohydrates, fats, and proteins into ATP. CoA forms part of the oxidative decarboxylation systems of alpha-ketoacids and is involved in fatty acid beta-oxidation. EFSA authorizes health claims for pantothenic acid contributing to normal energy-yielding metabolism, normal mental performance, and the reduction of tiredness and fatigue. Pantothenic acid is also essential for the synthesis of acetylcholine — the primary neurotransmitter enabling nervous system communication. Experimental deficiency in humans produces neurological symptoms including paresthesia, muscle weakness, and impaired coordination.

Choline — 120 mg

Choline is an essential nutrient recognized by the Institute of Medicine since 1998. It serves as a direct precursor to the neurotransmitter acetylcholine, which is critical for memory, attention, and mental alertness. Choline also provides methyl groups for one-carbon metabolism via its conversion to betaine, supporting SAMe regeneration and healthy homocysteine clearance. It is required for the synthesis of phosphatidylcholine, a structural phospholipid vital for cell membranes and hepatic lipid transport. Research shows that Choline insufficiency impairs cognitive performance, and most people in the United States consume less than the Adequate Intake for Choline.

Ascorbyl palmitate

Ascorbyl palmitate is a lipophilic (fat-soluble) derivative of ascorbic acid (vitamin C) used as a natural antioxidant. It has been granted Generally Recognized as Safe (GRAS) status by the FDA and is commonly included in supplement formulations for its antioxidant stabilization properties, helping protect fat-soluble nutrients from oxidative degradation.

Integrative Therapeutics

Active B-Complex

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Active B-Complex

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Who Should Consider It

Who Is Active B-Complex For?

This integrative therapeutics b complex may be well-suited for adults seeking comprehensive daily B-vitamin support in active, bioavailable forms. Because the formula contains methylfolate (Quatrefolic®) and methylcobalamin rather than folic acid and cyanocobalamin, it provides folate and B12 in forms that the body can use immediately — which may be particularly relevant for individuals with common genetic variations affecting MTHFR enzyme activity.

People who may especially benefit include those looking to support daily energy production, promote healthy methylation and homocysteine metabolism, or maintain nervous system and brain health. The formula's support for neurotransmitter production — including serotonin, dopamine, and GABA — makes it a thoughtful choice for those focused on cognitive and neurological wellness.

Active B-Complex is vegan, gluten-free, and free from wheat, soy, dairy, artificial colors, and flavors, making it accessible for individuals with common dietary sensitivities or preferences.

Usage

How to Take Active B-Complex

Adults take 1 or 2 capsules daily, preferably with food, or as recommended by a healthcare professional. If you are pregnant, nursing, or taking any medications, consult a healthcare professional before use.

About the author

Written by Greg Howlett

Greg Howlett

Founder

Greg has spent over a decade helping customers choose the right natural-health products. He personally vets every formula we carry and writes these guides to cut through the marketing noise with practical, experience-based advice.

FAQ

Frequently asked questions

What makes Active B-Complex different from other B-complex supplements?

Active B-Complex provides all 8 essential B-vitamins with the active, coenzyme forms of B2 (riboflavin-5'-phosphate), B6 (pyridoxal-5-phosphate), B12 (methylcobalamin), and folate (Quatrefolic® methylfolate). These active forms offer immediate bioavailability, meaning the body can use them without requiring additional metabolic conversion. It also includes an excellent source of Choline to support healthy brain function.

Why does this formula use methylfolate instead of folic acid?

Quatrefolic® methylfolate is the active form of folate that the body can use immediately. Folic acid is a synthetic form that must be converted through several enzymatic steps before the body can utilize it. Research suggests that some individuals have genetic variations (such as in the MTHFR gene) that may impair this conversion, making methylfolate a more directly available option.

How does the integrative therapeutics b complex support energy?

B-vitamins serve as cofactors and coenzymes in the metabolic pathways that convert carbohydrates, proteins, and fats into cellular energy (ATP). This formula supports energy production through thiamin and niacin's roles in the TCA cycle, riboflavin's role in the mitochondrial electron transport chain, pantothenic acid's role as a Coenzyme A precursor, and Vitamin B6's role in glycogen mobilization and amino acid metabolism.

Is Active B-Complex suitable for vegans?

Yes. Active B-Complex is vegan and is also gluten-free and free from wheat, soy, dairy, artificial colors, and flavors.

What role do B-vitamins play in nervous system and brain health?

B-vitamins are classified as neurotropic vitamins. In this formula, Vitamin B6 is a cofactor for the synthesis of neurotransmitters including serotonin, dopamine, and GABA. Vitamin B12 supports myelin synthesis and neuronal maintenance. Folate supports neurotransmitter synthesis and homocysteine clearance. Thiamin is essential for neurological function, and Choline is the direct precursor to acetylcholine, critical for memory and cognitive function.

How many capsules are in one bottle, and what is the serving size?

Each bottle contains 60 capsules with a serving size of 1 capsule. Adults may take 1 or 2 capsules daily, preferably with food, or as recommended by a healthcare professional.

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