Doctors Best

Fully Active B Complex

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To ‘B’ or not to ‘B’ – there really is no question, a great vitamin B complex is a must!


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Product overview

Doctor's Best Fully Active B Complex with Quatrefolic comprises the full spectrum of eight water-soluble B vitamins which are essential for normal physiological functioning and key contributors to the maintenance of optimal health.

  • Supports energy production, cell metabolism, enzyme functions and DNA synthesis necessary for all bodily processes for general health and wellbeing.
  • An easy one capsule daily dose providing the full spectrum of all 8 B vitamins in the best tolerated and most biochemically active forms
  • Suitable for immediate uptake and use in the body without any additional biochemical processing from the body require
  • Designed for optimal absorption, uptake and use in the body, ready to work immediately at the cellular level
  • Fully hypoallergenic, with no unhealthy colours or unnecessary additives
  • Non-GMO, Gluten free, Soy free, 100% vegan
What are activated B vitamins?

Vitamins exist in a range of different forms that are taken up and used by the body in different ways depending on the particular form it appears in. Active forms are those that can be utilised directly by the body without any additional biochemical processing required. This is important as there may be enzymatic mutations or deficiencies that impact the ability of the body to convert a non-active vitamin form into its activated form that can be used by cells. Doctor's Best Fully Active B Complex with Quatrefolic provides the full family of B-group vitamins in their biologically active form that require no further processing for use, providing superior uptake and activity for much less biochemical effort.

Why do we need B vitamins?

B vitamins play important roles in cellular metabolism, supporting DNA and enzyme functions, energy production and for supporting healthy bone, cardiovascular, nervous system and brain function. As the body cannot manufacture these essential nutrients for life, B vitamins must be obtained daily through the diet or supplementally. But B vitamins are also water-soluble and easily destroyed by light, heat, processing, freezing, canning and refining so not only are they difficult to find intact in foods, they are also easily excreted via the renal system so continual daily intake of relatively small amounts of B vitamins are required to replace those that are lost. Most chemical reactions that occur in the body require multiple members of the B-group family and cannot happen without them. A deficiency in any one B vitamin can impact on the functioning of the others. Just some of the primary functions of B vitamins include:

  • Energy production - the tiny energy-producing regions of our cells called mitochondria, which generate over 90% of our life energy, require all 8 B vitamins to produce the energy needed by every cell.
  • Utilisation of nutrients - B vitamins are needed for breaking down the macronutrients from our foods - carbohydrates, proteins and fatty acids, as well as for the utilisation and transport of oxygen, necessary nutrients to power cell function.
  • Liver and cholesterol support - some of the B vitamins, including B3, are necessary for supporting liver function to maintain healthy cholesterol levels, as well as detoxifying the effects of alcohol in the body. Furthermore, B vitamins are readily depleted in the body by excess alcohol intake or cigarette use.
  • Supports DNA synthesis - the genetic blueprint for building and maintaining the human body, DNA is housed in every cell. Folate is essential for supporting healthy DNA expression, cell division, cardiovascular function and nervous system function for mental and emotional wellbeing. Quatrefolic® folate is the most bioavailable form of folate for supporting DNA synthesis and regulation.
  • Cardiovascular health - B6, folate (B9) and B12 are essential for supporting the conversion of the amino acid homocysteine to methionine, one of the 20+ building blocks from which new proteins are built in the body. Keeping homocysteine levels in healthy balance is necessary for cardiovascular health.
  • Nerve tissue & brain health - the brain and nervous system have a high demand for B vitamins, particularly the methyl group molecules of activated folate (Quatrefolic®) and B12 (methylcobalamin) to form nerve connections (synapses). Vitamins B1, B2, B3, B6, B7 (biotin), B9 (folate) and B12 each have specific roles to play in supporting brain cell function with deficiencies leading to issues with neurological and psychological function.

Vitamin C (as ascorbic acid) 40 mg, Vitamin B1 (from thiamine HCl) 60 mg, Vitamin B2 (from riboflavin and riboflavin-5-phosphate) 75 mg, Vitamin B3 (as niacinamide and niacin) 50 mg, Vitamin B6 (from pyridoxine HCl and pyridoxal-5-phosphate) 50 mg, Folate (from Quatrefolic® (6S)-5-methyltetrahydrofolic acid, glucosamine sale) 400 mcg DFE**, Vitamin B12 (as methylcobalamin) 1000 mcg, Biotin (B7) 600 mcg, Pantothenic Acid (B5) (from d-calcium-pantothenate) 100 mg.

** DFE = Dietary Folate Equivalent

Other ingredients: Modified cellulose (vegetarian capsule), microcrystalline cellulose, magnesium stearate (vegetable source), silicon dioxide.

Does not contain: GMO, Gluten, Soy, Vegan

Suggested Use
Recommended intake:

Suggested Adult Use: Take 1 capsule daily with food, or as recommended by a nutritionally-informed physician.

  • If pregnant, nursing or taking medications, consult a healthcare practitioner prior to use.
  • Keep closed in dry place; avoid excessive heat.
  • Do not use if safety seal is broken or missing.
  • Keep out of reach of children.
  • Always read the label and use as directed. If symptoms persist see your healthcare practitioner.

The Doctor's Best difference

Doctor's Best is not interested in fads, trends or quick fixes. They want to know what works, how it works, and why it works, well before they offer it to you. They collaborate with nutritional scientists who are developing new ingredients and they study their clinical findings to determine the most effective way to provide the desired results. On every bottle, Doctor's Best lists all the ingredients, describes how the product works, and cites studies that support claims because they know getting all of your questions answered is what matters most.

Quality ingredients

Only trademarked, branded, and high-quality materials are used in Doctor's Best products; they are matched to the specific ingredient and strength studied in the clinical studies. All raw materials are verified for quality, added assurance that you'll never find substitutes in their products. Many of the products are non-GMO, gluten free, soy free and vegetarian or vegan. Doctor's Best use only cGMP-certified manufacturing facilities and their products are all GMP-certified, meaning consumers can be assured that the product is of an extremely high standard and contains nutrients targeted at sepcific health needs.

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