The Form of a B Vitamin Matters More Than the Name on the Label

Why folic acid and L-methylfolate are not the same thing — and what a common gene variation has to do with it  

If you browse the counters in the health food shops, or search online for almost any dietary supplement, whether it’s for cognitive health, general physical wellbeing, or multivitamin support, you're almost certain to find B vitamins listed on the labels. Folic acid. B12. B6. They're everywhere, they’re well-understood, and they’re widely accepted as important for the health of our brains. Did you know that some foods are deliberately fortified with small quantities of them to support general populational health (e.g. some breads and certain breakfast cereals)?  

What those labels rarely tell you is the form those vitamins are in.  

That's a missed opportunity to inform us and it's an important distinction. The form of the vitamin, not just the name, is where there is a meaningful difference between different supplements. For B vitamins in particular, the form affects how well your body can utilise what you've taken.  

A primer: what do B vitamins actually do?  

The B vitamins are an important group of eight water-soluble nutrients that a healthy body uses across a wide range of bodily cellular and chemical functions. Because of this, governments commonly support the fortification of some basic foodstuffs with them. Several of them are of direct relevance to our brain's continuing health. These powerful compounds contribute to normal psychological function, the normal functioning of the body's nervous system, and the reduction of tiredness and fatigue.  

These aren't just boasts made by some corporate marketing department. They are authorised health claims which are fully supported by the EU Nutrition and Health Claims Register, which is the regulatory framework used across the EU and in the UK.  

Let's look at why they are so important. B vitamins work as cofactors. That means they are required at a cellular level by the body's enzymes to enable many of the processes essential for life. The key ones include energy production, the synthesis of compounds the brain needs, and the maintenance of healthy cells both in the brain and throughout the rest of the body. 

At get dopa we pack six of the B vitamins which we consider the most useful into our formula, along with a carefully selected combination of ingredients and a vital probiotic which we cover in the other blogs in this series. 

These vitamins work as part of a clever, fully integrated system. This does mean that a shortage of one B vitamin doesn't just hamper that vitamin's function, but it can impair the whole network of processes. Because they are so important, the form of some of these vitamins becomes much more relevant.  

The required conversion steps 

Conversion is where things become interesting.  

The majority of dietary supplements and food fortification elements use inactive forms of B vitamins. This means substituting a product called Folic acid instead of folate. Cyanocobalamin is often used instead of B12. These inactive forms are stable and have the advantage that they are inexpensive to produce and primarily for these reasons, they have been used as the standard in supplements for many years. Decades in fact.  

But, and there is a but. Before the body can use these inactive forms, it has to convert them to a usable, active form. Folic acid must first be converted by our bodies into L-methylfolate, which is the active form our bodies can more easily utilise. In a similar way, cyanocobalamin has to be converted into methylcobalamin or adenosylcobalamin before it can be used.  

Most people undertake this conversion inside our bodies without any difficulty. But, for a significant percentage of the population they do not. Why is this?  

A gene variation that can change the equation  

Human genes define who we are, and as humans we share the vast majority of our genes. But we all have slight differences which define our differences and help shape our identity, something that's important for wider biological reasons. One of these variations in human genes effects the body's conversion of folate. This affects roughly 40% of people to a degree which varies across different populations, so it's really common. In its more significant form, it can substantially reduce the efficiency of a key human enzyme that is responsible for converting folic acid into its active, usable form.  

The result of this is that people with this variation may take in folic acid regularly, whether through vitamin fortified foods or from standard dietary supplements, but then convert relatively little of it into the L-methylfolate that their body can use.  

This isn't necessarily a problem. Most people with this gene variation don't even know they have it. They almost certainly have never been tested for it, and they may never experience a significant problem. But if we want to optimise nutritional intake, which is of course why we work with supplements, then getting the right form of folate matters more than the label suggests.  

The same principle also applies to B12. Cyanocobalamin similarly requires conversion steps within the body before it becomes active. The methylcobalamin that get dopa uses doesn't, it's already in the form the body can directly use.    

→ Folic acid  

Inactive form. Requires conversion to L-methylfolate before the body can use it. Conversion efficiency varies amongst people.  

→ L-methylfolate  

Active form. Used directly as no conversion is required. This is the form get dopa uses.  

→ Cyanocobalamin (B12)  

Standard inactive supplemental form. Needs multiple conversion steps. Cheaper to produce.  

→ Methylcobalamin (B12)  

Active form. Used directly by the body meaning higher bioavailability. This is the form get dopa uses.  

Why most supplements don't use the active forms  

The simple answer is that active forms of B vitamins cost more to source. L-methylfolate is more expensive than folic acid. Methylcobalamin is more expensive than cyanocobalamin. For mass food fortification programmes, or for supplement suppliers which are producing at volume, they have their profit margins to protect. The standard forms are the easy choice.  

There's also an interesting labelling reality: folic acid and L-methylfolate both appear as 'folate' on a nutrition panel. B12 shows as B12. So the consumer looking at two supplement labels side by side may see identical nutrient names at identical doses, with no indication that one has inactive forms which require several conversion steps the other doesn't because it uses the active form.  

Whilst this is not deception (it is within the rules), it is a meaningful difference that most brands have no commercial incentive to explain.     

The B vitamins in get dopa. Why each form was chosen  

get dopa contains six of the eight B vitamins, the ones we believe are most relevant to brain function. Each is in the form chosen for maximum bioavailability rather than on the basis of cost.  

1. Folate as L-methylfolate (200μg). The active form, requiring no conversion.  
2. B12 as methylcobalamin (50μg). The active form, used directly.  
3. B6 (pyridoxine) at 9mg. Contributes to the regulation of hormonal activity and to normal psychological function.  
4. B1 (thiamine) at 2.2mg. Contributes to normal psychological function and normal functioning of the nervous system.  
5. B3 (niacin) at 16mg. Contributes to normal psychological function and the reduction of tiredness and fatigue.  
6. B5 (pantothenic acid) at 10mg. Contributes to normal mental performance and the normal synthesis and metabolism of steroid hormones, vitamin D and some neurotransmitters. 

These B vitamins don't work in isolation from the rest of the get dopa formula. They're cofactors for the amino acid conversion processes which we described in part 1 of the Inside the Formula science series, and also for the energy processes. By including them in their active forms and at meaningful doses, we can ensure that our brain's raw material supply doesn't become the limiting factor.  

What about dosage?  

It's worth noting why higher doses don't automatically mean better outcomes, and why they can help. Because B vitamins are water-soluble, the excess is excreted from the body rather than stored. This underlines the need for regular, sustained intake. The doses in the get dopa formulation contain some which are well above the standard reference for daily intake. This reflects the specific demands placed on the brain's conversion and energy systems. These demands often occur during periods of high cognitive load, for example, periods of stress, difficult prioritisation, prolonged mental effort, complex decision making or balancing multiple mental tasks. What the reference standard indicates as needed is simply to avoid a particular vitamin deficiency.  

This is a big distinction and worth noting; the amount needed to prevent a clinical shortfall and the amount needed to optimally support a busy brain are not the same number.  

KEY TAKEAWAYS  

1. Most supplements and food fortification use the inactive forms of B vitamins (folic acid, cyanocobalamin) that require subsequent conversion by the body before we can properly utilise them.  
2. About 40% of people have a common gene variation which can reduce the efficiency of folate conversion. This means standard folic acid may be less useful to our bodies than the label might imply.  
3. The active forms of these vitamins (L-methylfolate, methylcobalamin) do not require conversion by our bodies. Most suppliers don't use them because they are more expensive to source. 
4. The get dopa formula uses the active forms of both folate and B12, alongside four other B vitamins. All in meaningful doses, not just enough to meet baseline sufficiency. This means get dopa provides doses supporting the high demand which can result from high cognitive load. 
5. The B vitamins work as part of a system and as cofactors for the amino acid processes. This is why the form of each one affects the whole process.      

NEXT IN THE SERIES  

Part 3 in our series looks at caffeine, the stuff you love or hate. We examine specifically what it actually does in the brain, why the effect is temporary by design, and how nutritional support works differently. It's a longer read because the caffeine story is more counterintuitive than you might realise.