Carnosine And Anti-Ageing
Quick Read Carnosine is a small molecule your muscles naturally produce that declines with age. Research suggests it fights three
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Vitamin B1, also called thiamine, is essential for your brain’s energy production and helps create chemical messengers that allow brain cells to communicate. Your body cannot store thiamine, so you need consistent intake from diet or supplements. Recent research shows that older adults who consume more B1 perform better on tests of memory, processing speed and thinking skills, and studies in animals suggest that maintaining adequate levels may help protect the brain as it ages.
Thiamine deficiency is rare in people eating a normal diet, but it can develop quickly because your body only stores about 18 days’ worth. Severe deficiency causes serious, sometimes permanent brain damage. Good news: thiamine supplements are completely safe at normal doses because excess amounts are simply excreted, so there is no risk of taking too much.
If you eat a varied diet with whole grains, legumes and fortified foods, you’re likely getting enough. If your diet is less than perfect, you drink alcohol regularly, or you’re over 60, paying attention to thiamine intake through a B-complex supplement or deliberate food choices makes practical sense. A benfotiamine form (more easily absorbed) shows early promise for brain protection, though human evidence is still limited.
Verdict: Maintaining adequate thiamine through diet or a simple daily B-complex supplement is one of the cheapest and safest things you can do to support brain health as you age.
What if one of the most important nutrients for your brain is one you’ve barely heard of? Most of us are familiar with vitamin D, omega-3, or magnesium, they dominate the wellness conversation. But quietly, in the background, vitamin B1 (thiamine) has been doing some of the most fundamental work in your brain since the day you were born. And the research suggests that as we age, many of us simply aren’t getting enough of it, with real consequences for how we think, remember and feel.
Vitacuity analysed over 1.77 million research papers and selected the most relevant studies on this topic. Here’s what the evidence actually says.
Thiamine is a water-soluble vitamin, meaning your body can’t store it in any meaningful quantity, and what you don’t use gets excreted. That makes regular intake genuinely important, not just a box-ticking exercise [1].
At its core, thiamine acts as a coenzyme, think of it as the ignition key for a number of critical biochemical processes. It is essential for converting carbohydrates into energy, for the metabolism of fats and proteins, and, crucially for our purposes, for energy production inside the mitochondria, the tiny power plants inside every one of your brain cells [1].
But thiamine’s brain role goes beyond energy. It is directly involved in neurotransmitter synthesis, the production of the chemical messengers that allow your brain cells to talk to each other. Research has also found that thiamine plays a role in acetylcholine synthesis, one of the neurotransmitters most closely associated with memory and learning [5]. And thiamine has antioxidant properties, helping protect brain tissue from oxidative stress, the kind of cellular wear and tear that accumulates over decades [1][3].
When thiamine levels fall, the consequences are not subtle. Mitochondria start to malfunction. Lactate and pyruvate, metabolic waste products, accumulate in brain tissue. In severe cases, this leads to a condition called Wernicke’s encephalopathy, characterised by confusion, loss of coordination and memory damage. Left untreated, it can progress to Wernicke-Korsakoff syndrome, a profound, largely irreversible dementia [1][15]. The good news is that for most of us, deficiency doesn’t reach those dramatic extremes. The less good news is that a subclinical shortfall, enough to blunt your brain function without triggering obvious symptoms, is more common than most people realise [9].
Evidence grade: Promising, large observational dataset, but cross-sectional design means we can’t confirm cause and effect.
In 2024, researchers published a cross-sectional analysis using data from the US National Health and Nutrition Examination Survey (NHANES) covering 2011 to 2014. The study included 2,422 adults aged 60 and over, a substantial sample for this type of research [2].
Participants completed two separate 24-hour dietary recall assessments (so researchers could average their typical food intake), and their cognitive function was measured across three validated tests: the Digit Symbol Substitution Test for processing speed, the Animal Fluency Test for executive function, and a CERAD subtest for memory.
The results were notable. Higher dietary vitamin B1 intake was significantly associated with better scores on processing speed (p < 0.001), executive function (p < 0.001), and overall global cognition (p = 0.008). When comparing the highest quartile of B1 intake to the lowest, the difference in processing speed scores was meaningful: a beta coefficient of 2.23 (95% CI: 0.79–3.67). The relationship was linear, meaning the more thiamine people consumed, the better they tended to perform cognitively, with no apparent ceiling effect detected [2].
A second independent analysis of the same NHANES dataset reached consistent conclusions, further strengthening the signal [4].
To be clear about what this does and doesn’t show: this is observational data. It tells us that people who eat more vitamin B1 tend to think more sharply as they age, but it can’t prove that the B1 itself is the cause. People with better diets overall also tend to have better cognitive health for many reasons. That said, the consistency of the association across multiple cognitive domains, and the size of the dataset, makes this a finding worth taking seriously.
Evidence grade: Strong, the mechanistic and clinical evidence here is well-established over decades of research.
The brain is extraordinarily energy-hungry. Despite accounting for roughly 2% of body weight, it consumes around 20% of the body’s total energy. And thiamine sits right at the centre of the biochemical machinery that produces that energy [1].
Three specific enzymes in the brain’s glucose metabolism pathway depend entirely on thiamine diphosphate (the active form of thiamine in the body): pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, and transketolase [14]. These aren’t minor supporting players, they are critical components of how your brain converts glucose into the energy it needs to function minute to minute.
Here’s what makes this particularly relevant for healthy ageing: research has found that these same thiamine-dependent enzymes are measurably reduced in the brains of Alzheimer’s disease patients. And notably, they are also reduced by thiamine deficiency alone, meaning that a functional shortfall of thiamine can produce brain changes that look biochemically similar to those seen in neurodegeneration [14].
In preclinical models, researchers have shown that artificially reducing thiamine levels can drive Alzheimer’s-like changes including memory deficits, amyloid plaque formation, and abnormal tau protein phosphorylation. Conversely, excess thiamine in the same models appears to diminish these pathological changes [14]. This doesn’t mean thiamine prevents Alzheimer’s in humans, that hasn’t been demonstrated in clinical trials, but it does tell us something important about why maintaining adequate thiamine status matters for brain health as we age.
Evidence grade: Promising, one randomised controlled trial, but with a modest sample and limited demographic range.
This finding surprised us. The assumption most people make is that thiamine supplementation only matters if you’re deficient. A 1997 randomised controlled trial published in the medical literature challenged that assumption [13].
One hundred and twenty young adult women were randomly assigned to receive either 50 mg of thiamine daily or a placebo for two months. Before and after the trial period, researchers measured mood, memory and reaction times.
The results: women who took thiamine reported feeling more clearheaded, composed and energetic. Reaction times were measurably faster following supplementation. Interestingly, memory itself was not significantly improved, but the processing speed and mood benefits were real.
The important detail: at baseline, these participants were not classified as thiamine deficient by the standard clinical criterion of the time. In other words, their thiamine status was considered “adequate”, and yet supplementation still appeared to produce measurable improvements [13].
This raises an interesting question: are current definitions of “adequate” thiamine status actually optimal for cognitive performance, or merely sufficient to avoid clinical deficiency? The research doesn’t fully answer this, but it’s a question worth sitting with.
Evidence grade: Promising, animal model data is encouraging; human clinical data is limited but positive for mild Alzheimer’s. More trials needed.
Standard thiamine from food or supplements is absorbed reasonably well in healthy individuals, but researchers have developed more bioavailable versions, most notably benfotiamine, a fat-soluble thiamine precursor that achieves higher tissue concentrations than standard thiamine alone [3][11].
The research on benfotiamine is genuinely interesting. In rodent models of neurodegeneration, it has demonstrated antioxidant and anti-inflammatory effects, and has shown benefits in models of both Alzheimer’s disease and diabetic nerve complications [3][11]. Crucially, these effects appear to operate through mechanisms beyond simply restoring coenzyme function, suggesting that higher-bioavailability thiamine derivatives may have direct neuroprotective properties in their own right [11].
In human terms, benfotiamine has been studied in patients with mild Alzheimer’s disease, where it appears to improve cognitive outcomes [11]. However, it’s important to be precise here: the human clinical evidence base is still limited in scale, and we should not overstate it. What we can say is that benfotiamine has no identified adverse effects, has clear mechanistic plausibility, and the early human data is encouraging [3][11].
A related compound, dibenzoylthiamine (DBT), has shown even stronger anti-inflammatory properties in laboratory studies, though this research is even earlier stage and remains largely preclinical [11].
Evidence grade: Strong, the clinical evidence on thiamine deficiency and brain damage is among the most well-established in nutritional neuroscience.
Thiamine deficiency is often thought of as something that only affects people with serious alcohol dependence, and it’s true that chronic heavy alcohol use is the most common risk factor, because alcohol both reduces thiamine absorption and increases its metabolic demand [1][9].
But the picture is broader than that. Research has identified multiple other at-risk groups: people with malabsorption conditions, those eating very restricted or highly processed diets, people following extreme weight loss protocols, and older adults whose absorption efficiency tends to decline with age [9][6].
The neurological consequences of deficiency are severe and well-documented. Wernicke’s encephalopathy, characterised by confusion, loss of coordination and eye movement abnormalities, can develop relatively rapidly. Untreated, it progresses to Wernicke-Korsakoff syndrome, a form of profound amnesia and dementia [1][15]. The critical point from the research: treatment with thiamine can produce dramatic clinical improvement, but only if given early enough. Once the syndrome progresses to the chronic stage, the damage is largely permanent [9][15].
Because thiamine is water-soluble and cannot accumulate in the body, even a few weeks of poor intake can begin to compromise function. The body’s thiamine stores are estimated to last only 18 days [6]. This is not a vitamin with a long buffer period.
The honest picture here is that while the foundational science of thiamine and brain function is among the most solid in nutritional neuroscience, there are real gaps in the clinical evidence, particularly at the supplementation end.
The Alzheimer’s treatment question remains genuinely open. Two Cochrane systematic reviews, from 2000 and 2001, evaluated the available randomised controlled trial evidence for thiamine as a treatment for Alzheimer’s disease symptoms [8][10]. The conclusion was not encouraging: with fewer than 50 participants across three trials, and inadequate reporting of results, it was simply not possible to draw conclusions either way. The data were, as one review put it, “compatible with thiamine producing harm, no change or improvement” [8]. This doesn’t mean thiamine doesn’t help, it means the research hasn’t been done rigorously enough to know. The more recent benfotiamine data is somewhat more promising, but still limited in scale [11].
Optimal dosing for cognitive benefit is unclear. The 1997 RCT used 50 mg per day, many multiples of the standard RDA [13]. The NHANES observational data relates to dietary intake rather than supplementation [2]. We don’t yet have well-powered RCTs establishing what dose of thiamine (or which form) produces the best cognitive outcomes in otherwise healthy older adults.
The observational data has limitations. The NHANES studies are large and well-designed, but cross-sectional by nature, they capture a snapshot in time, not a causal relationship. People who eat more thiamine also tend to have healthier diets overall, making it hard to isolate thiamine’s specific contribution [2][4].
Most benfotiamine research is animal-based. The mechanistic work on benfotiamine is genuinely exciting, but the majority of it comes from rodent models. Human trials are limited in number and size [3][11]. We need larger, longer RCTs before strong clinical recommendations can be made.
The “non-coenzyme” effects of thiamine remain incompletely understood. Recent research suggests thiamine and its derivatives may have direct effects on brain function beyond their coenzyme roles, including direct modulation of acetylcholine synthesis and membrane calcium transport [5]. These are early-stage findings, mostly from animal synaptosomes, but they open potentially significant avenues for future research.
Here’s what a sensible, well-informed person should actually do with this information.
First, the reassuring part: serious thiamine deficiency, with its devastating neurological consequences, is relatively rare in people eating a reasonably varied diet. You’re unlikely to be heading towards Wernicke’s encephalopathy. But the emerging picture from the research is that optimal thiamine status, not just “not deficient”, may matter for how clearly you think and how well your brain ages.
Thiamine is water-soluble. Your body excretes what it doesn’t use. There is no meaningful risk of toxicity at normal supplemental doses [1][9]. This puts it firmly in the “safe daily supplement” category.
The practical case for supplementing is strong for several reasons. Your body can only store about 18 days’ worth of thiamine at a time [6]. Absorption can become less efficient as we age. Dietary thiamine comes primarily from whole grains, legumes, pork and fortified foods, and if your diet is less than perfect (most people’s is), consistent intake is not guaranteed. At normal supplemental doses, the risk of deficiency almost certainly outweighs any theoretical risk of excess.
What to do:
– If you take a B-complex supplement daily, you’re already covered. Most B-complex formulations include thiamine in the range of 1–100 mg, well within safe and potentially beneficial territory. This is the simplest and most practical approach. – If you eat a highly processed diet, drink alcohol regularly, or are over 60, pay particular attention to your thiamine intake. These are the groups where shortfall is most likely to occur [1][6][9]. – If you’re interested in benfotiamine specifically, perhaps because you have a health condition associated with poor thiamine absorption, the early evidence is promising and the safety profile is excellent [3][11]. But be clear-eyed that the human clinical evidence is still limited. – You don’t need a blood test before supplementing. Unlike iron or fat-soluble vitamins where excess can cause harm, thiamine excess is harmlessly excreted. The case for simply supplementing consistently is practical and sound.
The broader message from the research is this: thiamine is not glamorous, it doesn’t have a marketing budget, and it’s rarely discussed in wellness circles. But it sits at the very foundation of brain energy metabolism, neurotransmitter production and neuroprotection. Keeping your levels consistently replete, through diet, supplementation or both, is one of the simplest, cheapest and most evidence-supported things you can do for your long-term brain health.
It’s the vitamin working quietly in the background. That’s no reason to ignore it.
[1] The importance of thiamine (vitamin B1) in humans (2023). *Biochemical Society Reports*. DOI: 10.1042/BSR20230374 | https://pubmed.ncbi.nlm.nih.gov/37389565/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10568373/
[2] Association between dietary vitamin B1 intake and cognitive function among older adults: a cross-sectional study (2024). *Journal of Translational Medicine*. DOI: 10.1186/s12967-024-04969-3 | https://pubmed.ncbi.nlm.nih.gov/38365743/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10870482/
[3] Thiamine and benfotiamine: Focus on their therapeutic potential (2023). *Heliyon*. DOI: 10.1016/j.heliyon.2023.e21839 | https://pubmed.ncbi.nlm.nih.gov/38034619/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10682628/
[4] Association of vitamin B1 intake with geriatric cognitive function: An analysis of the National Health and Nutrition Examination Survey (NHANES) from 2011 to 2014 (2024). https://pubmed.ncbi.nlm.nih.gov/38601615/
[5] Thiazolium salt mimics the non-coenzyme effects of vitamin B1 (2024). *Neurochemistry International*. DOI: 10.1016/j.neuint.2024.105791 | https://pubmed.ncbi.nlm.nih.gov/38880231/
[6] The role of thiamine in neurodegenerative diseases (2015). https://pubmed.ncbi.nlm.nih.gov/26400895/
[7] The importance of thiamine (vitamin B1) in humans (2023). *Biochemical Society Reports*. DOI: 10.1042/BSR20230374 | https://pubmed.ncbi.nlm.nih.gov/37389565/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10568373/
[8] Thiamine for Alzheimer’s disease (2000). *Cochrane Database of Systematic Reviews*. DOI: 10.1002/14651858.CD001498 | https://pubmed.ncbi.nlm.nih.gov/10796655/
[9] Thiamine (vitamin B1) deficiency and associated brain damage is still common throughout the world and prevention is simple and safe! (2006). https://pubmed.ncbi.nlm.nih.gov/16987159/
[10] Thiamine for Alzheimer’s disease (2001). *Cochrane Database of Systematic Reviews*. DOI: 10.1002/14651858.CD001498 | https://pubmed.ncbi.nlm.nih.gov/11405995/
[11] Neuroprotective Effects of Thiamine and Precursors with Higher Bioavailability: Focus on Benfotiamine and Dibenzoylthiamine (2021). *International Journal of Molecular Sciences*. DOI: 10.3390/ijms22115418 | https://pubmed.ncbi.nlm.nih.gov/34063830/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8196556/
[12] Association between dietary vitamin B1 intake and cognitive function among older adults: a cross-sectional study (2024). *Journal of Translational Medicine*. DOI: 10.1186/s12967-024-04969-3 | https://pubmed.ncbi.nlm.nih.gov/38365743/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10870482/
[13] Thiamine supplementation mood and cognitive functioning (1997). https://pubmed.ncbi.nlm.nih.gov/9122365/
[14] Vitamin B1 (thiamine) and dementia (2016). https://pubmed.ncbi.nlm.nih.gov/26971083/
[15] Neurological complications associated with vitamin B1 deficiency (thiamine) (1996). https://pubmed.ncbi.nlm.nih.gov/8721913/
This article is for informational purposes only and does not constitute medical advice. Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication or have a medical condition, consult your doctor before taking any supplement. These statements have not been evaluated by the Food and Drug Administration (FDA) or the Medicines and Healthcare products Regulatory Agency (MHRA). This product is not intended to diagnose, treat, cure, or prevent any disease.
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