02 - What Happens When a Performance Ingredient Enters the Mouth?
In our first article, we introduced the concept of the oral cavity as a physiological interface. The next question is more specific: what actually happens to a performance ingredient in the time between entering the mouth and producing an effect? The answer depends entirely on the ingredient in question, and, as we’ll come to, it does not always involve the ingredient reaching the bloodstream at all. The oral cavity itself is a genuinely complex biological environment through which that answer plays out. It contains saliva, highly vascularised mucosal tissue, sensory and chemosensory receptors, neural pathways and a resident microbiome, and each of these can influence the fate or effects of an orally delivered compound. For performance nutrition, this creates an opportunity to consider delivery not simply as a method of administration, but as part of the biological intervention itself.
Dissolution
Before an ingredient can interact with the oral environment, it first has to become available. In a dissolvable formulation, saliva hydrates the mint and initiates disintegration and dissolution, and the rate at which this happens is governed by formulation variables including particle characteristics, excipient selection, compression force, porosity and mint hardness. Dissolution therefore determines more than simply when a mint disappears. It determines the temporal profile over which its constituent ingredients become available within the oral cavity in the first place. A formulation engineered to dissolve over several minutes creates a fundamentally different exposure profile from one designed to disappear almost immediately, which makes dissolution time a genuine delivery parameter in its own right, rather than just a manufacturing specification to be optimised for convenience.
Oral transmucosal absorption
The buccal and sublingual mucosa contain a dense vascular network capable of permitting systemic absorption of suitable molecules. This principle is well established within pharmaceutical science, where buccal and sublingual routes have long been investigated as a way of bypassing aspects of gastrointestinal absorption and, for appropriate compounds, achieving relatively rapid systemic availability. However, oral exposure does not automatically translate into meaningful transmucosal absorption. Molecular size, lipophilicity, ionisation, aqueous solubility, formulation and contact time all influence permeability, so the important point here is not that every performance ingredient can be absorbed through the mouth. It is that delivery through the oral cavity opens up a different set of pharmacokinetic possibilities that would not otherwise exist.
Caffeine is a useful illustration of this. It is highly water soluble and readily absorbed following oral administration. A study in 2002, comparing caffeine gum with capsule administration (https://doi.org/10.1016/S0378-5173(01)00958-9) found earlier increases in plasma caffeine concentration with the gum, underlining the importance of oral exposure and formulation in determining caffeine kinetics. Formulation, in other words, is not neutral. It can shape how quickly an ingredient reaches circulation in the first place.
This is exactly what a part of Enduro is built around (spoiler alert!). A dissolvable format keeps caffeine in prolonged, direct contact with the oral mucosa, a route already shown to bypass aspects of gastrointestinal digestion and support rapid systemic uptake. Every element of the format is designed around the same set of variables: rate of absorption through the oral mucosa, the speed and character of onset, athlete compliance and tolerability, and sensory acceptability, all of which shape a caffeine dose’s real-world contribution to cognitive and physical performance. Nothing is wasted, and the full dose is available at the point of use, exactly when an athlete needs it. Whether this format ultimately delivers a faster or more effective caffeine profile than existing products is the question our research programme is built to answer, and we’re confident in the mechanism behind it.
Sensory signalling
Absorption is only one mechanism at play. The oral cavity also contains sensory receptors capable of responding to chemical compounds without those compounds needing to enter systemic circulation at all. Menthol is a clear example. It activates TRPM8 (https://pubmed.ncbi.nlm.nih.gov/11893340/), a cold-sensitive ion channel expressed on sensory neurons. This activation produces a genuine perception of cooling without any corresponding reduction in tissue or core temperature. This draws out an important distinction between physiological temperature and perceived temperature. During exercise, particularly in heat, sensory input of this kind contributes meaningfully to the perception of thermal strain and effort, so an oral intervention capable of modifying that sensory input could, in principle, influence how exercise is experienced without directly altering the underlying metabolic demand. The ergogenic significance of that distinction is now an active area of investigation within exercise science.
Oral signalling to the brain
As mentioned in our first blog (https://www.novamints.com/the-science-inside/blog-one), the mouth can also communicate directly with the central nervous system, and carbohydrate mouth-rinsing provides some of the clearest evidence of this. In 2004, Carter, Jeukendrup and Jones (https://pubmed.ncbi.nlm.nih.gov/15570147/) demonstrated that carbohydrate mouth-rinsing could improve cycling performance despite the solution being expectorated rather than swallowed. Five years later, Chambers, Bridge and Jones (https://pmc.ncbi.nlm.nih.gov/articles/PMC2683964/) subsequently used functional MRI to investigate the underlying mechanism, and found that oral exposure to carbohydrate activated brain regions associated with reward, motivation and motor control, including areas of the striatum, orbitofrontal cortex and anterior cingulate cortex. Comparable activation was not observed with an equally sweet artificial sweetener solution. This suggests the oral cavity can detect carbohydrate through mechanisms extending beyond conventional sweetness perception, and can communicate that information to the brain before any meaningful metabolic contribution occurs. This helped establish a broader principle worth stating plainly: an oral nutritional stimulus can generate a central nervous system response without requiring systemic delivery of the nutrient itself. The magnitude and reproducibility of these effects remain areas of active research.
The oral microbiome as part of the pathway
For some compounds, the oral cavity is not simply a site of exposure or absorption. It is part of the metabolic pathway itself. Dietary nitrate is an important example of this. Following nitrate ingestion, circulating nitrate becomes concentrated in saliva, where oral bacteria reduce it to nitrite, which can subsequently contribute to nitric oxide production through several downstream pathways, as described in a widely cited review of the nitrate-nitrite-nitric oxide pathway (https://www.nature.com/articles/nrd2466). The oral microbiome is therefore directly involved in nitrate metabolism. That makes nitrate particularly interesting from a delivery perspective, because in this case the oral cavity is not merely an alternative route to systemic circulation. It is part of the mechanism through which the intervention exerts its physiological effects.
Why residence time matters
These mechanisms introduce a variable that conventional oral supplementation often treats as incidental: time. A conventional capsule may spend only a brief period in the oral cavity before being swallowed, whereas a dissolvable formulation can be designed to maintain contact with the oral environment for several minutes, and that difference changes the entire exposure profile. Longer residence could extend the duration over which soluble ingredients remain available within saliva, oral sensory receptors are stimulated, nutrient detection occurs, transmucosal exchange can take place, and sensory compounds are released. It does not follow, however, that longer exposure will necessarily produce a greater physiological effect. Receptor adaptation, concentration, solubility and the properties of the individual compound will all influence the response, so the scientific question is not simply whether more time is better. It is whether exposure time can be deliberately designed to influence the response in a given direction.
One mouth, multiple mechanisms
The same oral environment can therefore support fundamentally different biological interactions, which may also coexist within a single intervention:
Absorption: ingredient → oral mucosa → systemic circulation
Sensory signalling: ingredient → receptor → sensory afferent pathway → central nervous system
Nutrient signalling: ingredient → oral detection → central nervous system → behavioural or motor regulation
Oral metabolism: ingredient → oral microbiome → metabolic transformation → downstream physiology
This is where the distinction between an ingredient and its delivery system becomes genuinely important. The biological effect of a performance intervention may depend not only on what molecule is delivered, but on where it is first encountered, how quickly it becomes available, and how long the oral environment is exposed to it.
From molecule to mouth
This is the scientific premise behind Novamint. We are interested in what happens between an ingredient entering the mouth and the athlete experiencing its effects: molecule, formulation, dissolution, oral exposure, absorption, sensory signalling, oral metabolism, and finally systemic and central effects that translate into performance.
Not every ingredient will benefit from oral delivery. Not every compound will cross the oral mucosa. Prolonged exposure will not necessarily produce a greater response. Those limitations are precisely why these questions need to be tested experimentally rather than assumed. The opportunity is to understand whether the oral cavity can be deliberately incorporated into the design of performance interventions, not simply as the first step before swallowing, but as a biological environment capable of influencing delivery, sensation, signalling and, potentially, performance itself.
For Novamint, that is what the science of delivery is about: understanding what happens between molecule and mouth, and what happens next. Oral Performance Science.
