Integrative Therapeutics Active B-Complex Guide

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

A deep-dive guide on Integrative Therapeutics Active B-Complex: all 8 essential B-vitamins with active forms for energy, methylation, and nervous system support.

Overview

What Is Integrative Therapeutics Active B-Complex?

Integrative Therapeutics Active B-Complex is a comprehensive blend of all eight essential B-vitamins, formulated with the active forms of B2 (riboflavin-5'-phosphate), B6 (pyridoxal-5-phosphate), B12 (methylcobalamin), and folate (Quatrefolic® methylfolate) for immediate bioavailability. It also includes an excellent source of Choline to support healthy brain function.

This high-potency formula is designed to support daily energy production, neurotransmitter synthesis, and nerve function, promoting brain and nervous system health. By providing activated forms rather than standard vitamers, Active B-Complex helps ensure that these nutrients are readily available for use by the body without requiring additional conversion steps.

Active B-Complex is gluten-free and vegan, and free from wheat, soy, dairy, artificial colors, and flavors. Each bottle contains 60 capsules.

Why It Matters

Energy, Methylation, and Nervous System Support

B-vitamins play essential roles in cell function, growth, and energy production. They support the metabolism of carbohydrates, proteins, and fats, converting food into fuel to help you tackle the day. Without adequate B-vitamin status, the body's ability to generate cellular energy, synthesize neurotransmitters, and maintain healthy nerve function may be compromised.

The methylation cycle — a critical biochemical pathway involved in DNA synthesis, detoxification, and homocysteine metabolism — depends on several B-vitamins working together. Folate, B12, B6, and B2 each contribute at key enzymatic steps. Active B-Complex provides these nutrients in forms that are ready for immediate participation in these pathways.

B-vitamins also help support the nervous system's synthesis of serotonin, dopamine, and GABA — neurotransmitters closely linked to mood regulation, cognitive function, and overall well-being. This interconnected role across energy, methylation, and neural health is what makes a comprehensive B-complex an important foundational supplement.

What's inside

Key Ingredients

Thiamin (Vitamin B1) — 50 mg

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 thiamin's critical role in energy-yielding metabolism, and European regulatory authorities have authorized a health claim confirming B1 contributes to normal energy-yielding metabolism. Thiamin is also essential for neurological function, acting as a cofactor in glucose metabolism that indirectly supports the synthesis of neurotransmitters, myelin, and nucleic acids in the nervous system. Deficiency causes severe neurological disorders including Wernicke's encephalopathy and peripheral neuropathy. Studies also indicate thiamin is directly required for the synthesis of acetylcholine and modulates GABA and glutamate levels, supporting neurotransmitter balance.

Riboflavin (Vitamin B2) — 50 mg

Riboflavin is the precursor to the coenzymes FAD and FMN, which 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 B2 indispensable for cellular ATP production. EFSA has authorized a health claim for riboflavin contributing to energy-yielding metabolism and reduction of tiredness and fatigue. As the obligate coenzyme (as FAD) for MTHFR, riboflavin supports methylation by converting 5,10-methyleneTHF to 5-MTHF. Research demonstrates that riboflavin deficiency impairs MTHFR activity, reduces 5-MTHF levels, and elevates homocysteine, especially in individuals with the MTHFR 677TT genotype. Riboflavin supplementation has been shown in RCTs to specifically lower homocysteine in individuals homozygous for the MTHFR 677C>T polymorphism.

Niacin (Vitamin B3) — 100 mg

Niacin is the precursor to NAD+ and NADP+, coenzymes essential for over 500 enzymatic reactions including glycolysis, the TCA cycle, and oxidative phosphorylation. Niacin deficiency (pellagra) causes profound fatigue. EFSA authorizes the health claim that niacin contributes to normal energy-yielding metabolism. NAD+ is also critical for neuronal energy metabolism, DNA repair, and survival of neurons. Severe deficiency causes pellagra with neurological manifestations including confusion and dementia. Niacin spares tryptophan from the kynurenine pathway, preserving its availability for serotonin synthesis, and supports energy metabolism in neurotransmitter-producing neurons. EU authorized health claims recognize niacin's contribution to normal psychological function and reduction of tiredness.

Vitamin B6 (as Pyridoxal-5-Phosphate) — 50 mg

Provided in its active coenzyme form, pyridoxal-5-phosphate (PLP), Vitamin B6 is a cofactor for over 100 enzymatic reactions including glycogen phosphorylase for muscle glycogen mobilization and amino acid metabolism. EFSA authorizes the health claim that B6 contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue. PLP is the essential coenzyme for decarboxylation reactions producing serotonin (from 5-HTP), dopamine (from L-DOPA), and GABA (from glutamate). Without PLP, all three neurotransmitter pathways are impaired. B6 also supports methylation by enabling the transsulfuration pathway — the CBS-catalyzed conversion of homocysteine to cystathionine and glutathione — clearing homocysteine from the methylation cycle and supporting methionine production for SAMe synthesis. Deficiency is associated with peripheral neuropathy, and B6 is classified as a neurotropic vitamin essential for nerve function.

Folate (as Quatrefolic® Methylfolate) — 800 mcg

Provided as Quatrefolic® methylfolate, this is the biologically active form of folate (5-MTHF) that is immediately bioavailable without requiring conversion by the MTHFR enzyme. Folate facilitates transport of methyl groups in the one-carbon pathway for DNA methylation and homocysteine remethylation. Deficiency produces global hypomethylation and impaired SAMe synthesis. As 5-methyltetrahydrofolate, folate 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, critical for one-carbon methylation supporting neurotransmitter synthesis. EFSA recognizes that folate contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue. Deficiency causes megaloblastic anemia and significant fatigue due to impaired red blood cell production and oxygen delivery.

Vitamin B12 (as Methylcobalamin) — 1000 mcg

Provided as methylcobalamin, the metabolically active form directly utilized by nerve tissue. Vitamin B12 is essential for methionine synthase, which remethylates homocysteine to methionine using 5-MTHF, directly sustaining the SAMe/methylation cycle. B12 deficiency stalls this reaction, trapping folate in the methyl-folate trap and elevating homocysteine. Research confirms B12 is critical for myelin synthesis and neuronal maintenance; deficiency causes subacute combined degeneration of the spinal cord, peripheral neuropathy, and cognitive changes. Supplementation is well-established to reverse neurological symptoms of B12 deficiency. B12 deficiency is also among the most common and well-documented causes of chronic fatigue and megaloblastic anemia; repletion in deficient individuals reliably and significantly improves fatigue and energy. EFSA authorizes the health claim that B12 contributes to normal energy-yielding metabolism.

Biotin (Vitamin B7) — 300 mcg

Biotin is an essential coenzyme for five carboxylase enzymes involved in fatty acid synthesis, gluconeogenesis, and amino acid catabolism — all central to energy homeostasis. EFSA authorizes the health claim that biotin contributes to normal energy-yielding metabolism. Biotin also serves as the cofactor for mitochondrial carboxylase enzymes including pyruvate carboxylase (TCA cycle anaplerosis), propionyl-CoA carboxylase (branched-chain amino acid and odd-chain fatty acid catabolism), and methylcrotonyl-CoA carboxylase — all localized in the mitochondrial matrix and essential for mitochondrial metabolic flux. Deficiency impairs energy metabolism and causes fatigue.

Pantothenic Acid (Vitamin B5) — 100 mg

Pantothenic acid is the precursor to Coenzyme A (CoA), which is essential for the activation of acetyl groups entering the TCA cycle, fatty acid beta-oxidation, and the synthesis of ATP-precursor substrates. Without B5, cellular energy metabolism cannot proceed. EFSA authorizes a health claim for pantothenic acid contributing to normal energy-yielding metabolism and reduction of tiredness and fatigue. B5 is also essential for the synthesis of acetylcholine, the primary neurotransmitter enabling nervous system communication. Experimental B5 deficiency in humans produces neurological symptoms including paresthesia, muscle weakness, and impaired coordination. EU health claims recognize its contribution to normal mental performance.

Choline — 120 mg

Choline is an essential nutrient and a direct precursor to the neurotransmitter acetylcholine, which is critical for memory, attention, and mental alertness. Choline insufficiency impairs cognitive performance, and supplementation supports cholinergic neurotransmission. Choline is also the metabolic precursor to betaine (trimethylglycine), which donates methyl groups to homocysteine via BHMT, supporting SAMe regeneration and the methylation cycle. Higher dietary Choline intake is associated with lower circulating homocysteine concentrations. Choline deficiency reduces hepatic SAMe and impairs methylation. It is classified as a canonical methyl nutrient in multiple peer-reviewed sources and is required for the synthesis of phosphatidylcholine, which enables proper hepatic lipid metabolism.

Ascorbyl palmitate

Ascorbyl palmitate is a lipophilic (fat-soluble) derivative of ascorbic acid (vitamin C) used in this formula. Its presence contributes to the ascorbic acid content of the supplement and helps protect fat-soluble antioxidants. Research suggests that Ascorbyl palmitate can regenerate alpha-tocopherol (vitamin E) after it has been oxidized by free radicals, acting synergistically with other antioxidants to support the stability and integrity of the formula.

Integrative Therapeutics

Active B-Complex

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Active B-Complex

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Who Benefits

Who Is Active B-Complex For?

Integrative Therapeutics Active B-Complex may be well-suited for adults seeking comprehensive B-vitamin support for daily energy, methylation, and nervous system health. The inclusion of active, coenzymated forms — including pyridoxal-5-phosphate, methylcobalamin, riboflavin-5'-phosphate, and Quatrefolic® methylfolate — makes this formula particularly relevant for individuals who may have difficulty converting standard B-vitamin forms to their active states.

People with dietary gaps, those following vegan or vegetarian diets (who may be at elevated risk for B12 deficiency), and individuals concerned about maintaining healthy homocysteine levels may find this formula supportive. The active forms of folate and B12 may also be of particular interest to individuals with common MTHFR gene variants that can reduce the efficiency of folate metabolism.

Because B-vitamins play interconnected roles in energy production, neurotransmitter synthesis, and cellular metabolism, Active B-Complex is designed as a foundational daily supplement for overall vitality and well-being.

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.

Each serving size is 1 capsule. The bottle contains 60 capsules.

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 a standard B-complex?

Active B-Complex provides the active, coenzymated forms of key B-vitamins — including riboflavin-5'-phosphate (B2), pyridoxal-5-phosphate (B6), methylcobalamin (B12), and Quatrefolic® methylfolate — for immediate bioavailability. These forms do not require additional enzymatic conversion by the body, which may be particularly beneficial for individuals with genetic variations that affect B-vitamin metabolism.

Does Active B-Complex contain all eight B-vitamins?

Yes. Active B-Complex provides all eight essential B-vitamins: thiamin (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), Vitamin B6, biotin (B7), folate (B9), and Vitamin B12. It also includes Choline to support healthy brain function.

Is Active B-Complex suitable for vegans and people with dietary restrictions?

Yes. Active B-Complex is gluten-free and vegan. It is free from wheat, soy, dairy, artificial colors, and flavors, making it suitable for individuals with common dietary restrictions.

How does Active B-Complex support energy?

B-vitamins support energy production by participating in the metabolism of carbohydrates, proteins, and fats, converting food into fuel. Key ingredients such as thiamin, riboflavin, niacin, pantothenic acid, B6, and B12 are all cofactors for enzymes involved in mitochondrial ATP production and the citric acid cycle. EFSA has authorized health claims for several of these vitamins confirming they contribute to normal energy-yielding metabolism and the reduction of tiredness and fatigue.

What is Quatrefolic® methylfolate?

Quatrefolic® is a branded form of 5-methyltetrahydrofolate (5-MTHF), the biologically active form of folate. Unlike folic acid, which must be converted by the body through several enzymatic steps, Quatrefolic® methylfolate is immediately bioavailable. This is especially relevant for individuals with MTHFR gene variants that may reduce the body's ability to convert standard folic acid.

How does Active B-Complex support methylation and homocysteine metabolism?

Active B-Complex includes several nutrients that research identifies as critical for the methylation cycle. Folate (as 5-MTHF) donates a methyl group for homocysteine remethylation. Vitamin B12 (as methylcobalamin) is an essential cofactor for methionine synthase in this same pathway. Vitamin B6 enables the transsulfuration pathway that clears homocysteine. Riboflavin serves as the obligate coenzyme for MTHFR, and Choline contributes methyl groups via its conversion to betaine. Together, these nutrients support healthy homocysteine metabolism and methylation processes.

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