Epa Vs Dha — Which Omega-3 Matters More For Your Brain?
Quick Read EPA and DHA are two different omega-3 fatty acids found in fish oil, and they work differently in
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Fatigue happens when your cells’ power stations, called mitochondria, can’t produce enough energy. Several supplements have real scientific evidence behind them: B vitamins and micronutrients form the foundation since most people don’t eat enough variety to get optimal levels, and studies show supplementing these reduces fatigue and improves mood. CoQ10 combined with NADH showed the strongest results in a 12-week study of 207 people with chronic fatigue. Rhodiola rosea, beta-glucans, and ginseng also have meaningful research backing their use for reducing tiredness and boosting energy.
The honest picture is that most evidence comes from people with serious fatigue conditions rather than everyday tiredness, and different studies measure fatigue differently, making comparisons tricky. Start with B vitamins and a multi-micronutrient supplement as a safe, affordable baseline. If fatigue persists, adding CoQ10 is worth considering. However, persistent unexplained fatigue deserves a conversation with your doctor to rule out thyroid problems or anaemia before relying on supplements alone.
Verdict: Several supplements, particularly B vitamins, CoQ10 plus NADH, and Rhodiola, have promising evidence for reducing fatigue, but they work best as part of good sleep and nutrition habits, not as replacements for medical evaluation.
You’ve probably tried coffee. Maybe an extra hour in bed. Perhaps a B vitamin complex someone recommended on a forum. But if you’re in your forties, fifties or sixties and struggling with persistent tiredness that doesn’t quite respond to the obvious fixes, you might be wondering: is there anything in the supplement world that actually works? Not the marketing hype, the real evidence.
The honest answer is: yes, some things do show genuine promise. But the picture is more nuanced than most supplement brands will tell you. Vitacuity has analysed over 1.77 million research papers and selected the most relevant studies on this topic, and what they show is a field that is genuinely developing, with some standout findings and some important gaps. Here’s what the science actually says.
Before we get to the supplements, it helps to understand *why* you feel exhausted in the first place, because the mechanism matters.
At the cellular level, your energy comes from tiny organelles called mitochondria. Think of them as the power stations inside every cell in your body. Their job is to take the food you eat and convert it into a usable form of energy called ATP (adenosine triphosphate). ATP is the currency your muscles, brain and organs spend to do literally everything.
When mitochondrial function declines, which happens naturally with age, chronic illness, or nutritional deficiencies, ATP production falls. The result is a kind of cellular energy crisis that manifests as the physical and mental exhaustion you feel in your daily life [6].
Several key nutrients are directly involved in this energy-production process. When they’re in short supply, the whole system runs less efficiently. That’s the biochemical rationale behind many of the supplements we’re about to discuss [12]. And it’s why this isn’t just speculation, there’s a genuine mechanism to investigate.
Evidence grade: Strong for deficiency-linked fatigue; Promising for supplementation in replete individuals
Let’s start with the basics, because they matter more than people realise. B vitamins, all eight of them, from B1 (thiamine) to B12, are directly involved in energy-yielding metabolism. They act as coenzymes at multiple stages of ATP production, oxygen transport, and neuronal function. Without adequate levels, the whole energy pathway slows down [12].
A 2020 narrative review published in *Nutrients* laid out the biochemical evidence clearly: B vitamins, vitamin C, iron, magnesium and zinc all play recognised roles in energy production and neurological function. The review connected suboptimal levels of these micronutrients, even levels that don’t quite qualify as clinical deficiency, with physical and mental fatigue, cognitive slowing, and low mood [12].
What makes this particularly relevant for people in midlife is the finding that suboptimal micronutrient intakes are *common even in industrialised countries*. A 2021 review in a Spanish nutrition journal found that intakes of vitamins A, D, E, folate, iron, zinc and selenium are suboptimal across all age groups, and that when multiple micronutrients were supplemented together in well-conducted trials, participants showed reduced mental and physical fatigue, improved speed and accuracy on cognitive tasks, and reduced stress [9].
The practical implication here is straightforward: if you’re not consistently eating a varied, nutrient-dense diet, and most of us aren’t, all the time, B vitamin and multi-micronutrient supplementation is a sensible baseline [9][12].
Evidence grade: Promising, some solid RCT data, but mostly from chronic fatigue populations
Coenzyme Q10 (CoQ10) is a molecule your mitochondria use directly in the electron transport chain, the final stage of ATP production. NADH (the reduced form of nicotinamide adenine dinucleotide) is the fuel that feeds into that chain. Both are produced naturally by the body, but levels decline with age, and both have been studied specifically for their effect on fatigue [6][14].
The most compelling human trial to date is a 12-week randomised, double-blind, placebo-controlled study of 207 patients with ME/CFS (myalgic encephalomyelitis/chronic fatigue syndrome), one of the most severe forms of persistent fatigue. Participants received either 200mg of CoQ10 combined with 20mg of NADH daily, or a placebo. The combination supplementation produced measurable improvements in perceived fatigue, sleep quality, and health-related quality of life compared to placebo [15].
This is meaningful data: 207 participants, double-blind design, 12 weeks of follow-up. That’s not a small lab experiment [15].
Two separate 2025 systematic reviews of nutraceutical interventions in ME/CFS, both drawing from databases including PubMed, Cochrane and clinical trial registries, identified NADH and CoQ10 as among the most consistently supported supplements for reducing subjective fatigue symptoms [1][7].
A 2024 overview in a peer-reviewed journal went further, reviewing the evidence for CoQ10 specifically in post-viral fatigue syndromes including ME/CFS, fibromyalgia and long COVID. It found an accumulating body of evidence linking mitochondrial dysfunction and low-grade systemic inflammation in these conditions, and identified CoQ10 supplementation as a promising therapeutic strategy for addressing chronic fatigue and pain [14].
One important caveat: most of the strongest human trials have been conducted in people with diagnosed fatigue conditions, not the general healthy population. Whether the same magnitude of effect applies to someone who is simply tired from the pressures of modern life is not yet fully established.
Evidence grade: Promising, multiple RCTs, but studies are small and varied
Rhodiola rosea is a plant that grows at high altitudes and northern latitudes. It has a long history of traditional use in Russia and Scandinavia for stamina and stress resistance, but what does the formal research say?
A 2012 systematic review published in a peer-reviewed journal specifically set out to evaluate the evidence for Rhodiola’s effect on physical and mental fatigue. It identified multiple randomised controlled trials and concluded there was reasonable evidence for performance-enhancing and anti-fatigue effects in healthy populations, as well as therapeutic potential in clinical populations [10].
The mechanism likely involves Rhodiola’s adaptogenic properties, its ability to modulate the body’s stress response and reduce the physiological cost of mental and physical effort. A 2019 review of natural medicines for fatigue treatment also highlighted Rhodiola as one of the most evidenced natural compounds, alongside ginseng and Cordyceps, noting specific anti-fatigue effects with a relatively low side-effect profile [11].
The honest qualification here is that the RCTs in this area tend to be small, and study designs vary considerably, different dosages, different populations, different fatigue measures. The direction of evidence is consistently positive, but we’re not yet at the level of certainty we’d want before declaring it definitively effective.
Evidence grade: Promising, 16 RCTs, consistent direction, but needs more research
Beta-glucans are naturally occurring polysaccharides found in oats, mushrooms and yeast. They’re most commonly discussed in the context of immune health, but a 2025 systematic review and meta-analysis focused specifically on their effect on fatigue makes for interesting reading.
The meta-analysis included 16 RCTs with a total of 1,449 participants, a reasonable evidence base. The results showed that beta-glucans significantly reduced feelings of fatigue (standardised mean difference of -0.32, 95% CI -0.53 to -0.12; p = 0.002), significantly increased vigour (SMD = 0.46, 95% CI 0.26–0.66; p < 0.0001), and improved overall mood state (SMD = 0.32; p = 0.003) compared to placebo [5].
Those are meaningful effect sizes, not dramatic, but consistent and statistically robust across the studies. The review concluded that beta-glucans may be effective in reducing fatigue in healthy individuals, while acknowledging that the number of studies is still limited and further trials are needed [5].
This is one of the more underappreciated findings in the fatigue supplement literature, beta-glucans rarely feature in mainstream discussions, yet they have one of the better-quality evidence bases here.
Evidence grade: Promising for ginseng (cancer-related fatigue); Early stage for general fatigue
American ginseng has enough clinical evidence behind it that a 2019 review of integrative therapies specifically recommended it as an option *during active cancer treatment* for cancer-related fatigue, one of the most debilitating and difficult-to-treat forms of exhaustion [13]. That’s a meaningful endorsement in a rigorous, evidence-based clinical context.
The 2019 review of natural medicines for fatigue also highlighted ginseng (alongside Cordyceps militaris and Rhodiola) as having the strongest evidence among traditional plant-based treatments, with specific anti-fatigue bioactive compounds identified and some clinical trial data to support their use [11].
Cordyceps, a medicinal fungus, has bioactive compounds that appear to support energy metabolism through effects on cellular energy pathways. The research here is less mature than for ginseng, with more evidence coming from animal and lab studies than from well-powered human trials [11].
The practical takeaway: ginseng has a stronger evidence base than Cordyceps for human fatigue, but both show genuine mechanistic promise.
Evidence grade: Promising, real-world prospective data, but complexity acknowledged
A 2025 prospective study looked specifically at the association between vitamin and mineral supplement use and fatigue in the general population [4]. The study is notable because it moved beyond clinical populations, these were everyday people, not patients with diagnosed conditions.
The research acknowledged that while supplement use is popular, the relationship between supplementation and fatigue is “sparse and conclusions are mixed” in the existing literature [4]. This is the honest truth: individual supplement studies often conflict because fatigue is a heterogeneous symptom with many causes. Whether supplementation helps depends significantly on whether you were deficient or sub-optimal in the first place.
This reinforces the logic of the broader micronutrient research: the people most likely to benefit from supplementation are those whose baseline nutrient status is less than optimal, which, as we noted earlier, covers a substantial proportion of the general population.
Evidence grade: Early stage, meta-analysis exists but findings are conflicted
A 2025 systematic review and meta-analysis specifically investigated whether the *timing* of nutritional supplement intake affects recovery from post-exercise fatigue. The review found that timing does appear to matter, but the evidence is conflicted, with inconsistency across studies about the optimal window for supplementation [3].
This is genuinely useful to know, even in its conflicted state. It suggests that simply taking a supplement may not be the whole story, when you take it relative to exercise or sleep may also play a role. More research is needed before specific timing recommendations can be made with confidence.
It would be dishonest to write this piece without being clear about the genuine limitations in the research.
Most of the strongest evidence comes from clinical populations. The best RCTs on CoQ10, NADH and related supplements have been conducted in people with ME/CFS, fibromyalgia or post-viral fatigue, serious conditions. Whether the same magnitude of benefit applies to someone experiencing everyday tiredness at 52 is a genuinely open question [1][15].
Standardisation is a real problem. A 2025 systematic review of ME/CFS supplementation trials specifically noted that many clinical trials do not use the NIH’s recommended standardised outcome measures, which makes it very difficult to compare results across studies or draw firm conclusions [1][7]. Different trials measure “fatigue” in different ways, which partly explains why results can look conflicted.
Most natural medicine research is in animals. While ginseng and Cordyceps have human trial data, a significant portion of the mechanistic research is still in animal or laboratory models [11]. Human trials exist but are often small and short in duration.
The beta-glucan evidence, while promising, needs more trials. The 2025 meta-analysis itself acknowledged that 16 RCTs is a reasonable but not conclusive base, and called for further research [5].
Supplement timing research is immature. The 2025 review on supplement timing found conflicting results and could not yet make definitive recommendations about optimal dosing windows [3].
Individual variation matters enormously. Fatigue has many causes, poor sleep, stress, nutrient deficiencies, thyroid issues, low iron, and more. A supplement that addresses one root cause won’t help if your fatigue has a different origin entirely. The research often can’t account for this complexity.
Here’s what a sensible, well-read friend would actually tell you, based on everything the research shows.
Start with the foundation. B vitamins and a broad multi-micronutrient supplement are your first move, not because they’re exciting, but because they’re the most evidence-backed and the safest place to begin. B vitamins are water-soluble, which means any excess is excreted in urine. There is no meaningful risk of taking them daily. Given how common suboptimal micronutrient levels are, even in people who eat reasonably well, supplementing daily is a practical and sensible default [9][12].
Take CoQ10 seriously. The combination of CoQ10 and NADH has the best RCT evidence of any supplement pairing in the fatigue space. The 12-week, 207-person double-blind trial is real data [15]. If your fatigue is persistent and nothing obvious explains it, a 200mg CoQ10 supplement daily is a low-risk, potentially high-reward intervention. CoQ10 is fat-soluble, so take it with a meal containing healthy fat for better absorption.
Consider Rhodiola if your fatigue has a stress and mental exhaustion component. The adaptogenic evidence is consistent enough across multiple RCTs to make it worth trying, particularly if you’re experiencing the kind of brain-fog tiredness that comes with prolonged mental effort or high stress [10][11].
Don’t overlook beta-glucans. They’re under-discussed, but the 2025 meta-analysis of 1,449 participants is genuinely impressive for this area of research. Oat-based beta-glucans are inexpensive, widely available, and have a broad evidence base beyond just fatigue [5].
Ginseng is worth considering, particularly American ginseng if your fatigue is significant and persistent. It has enough clinical trial backing that it’s been recommended in formal oncology care guidelines for fatigue [13].
One final, important point: persistent, unexplained fatigue that doesn’t respond to sleep, stress management and basic nutritional support is worth discussing with your GP. Supplements can meaningfully support energy metabolism, the research is clear on that, but they’re not a substitute for ruling out thyroid problems, anaemia, or other treatable conditions. Think of them as a serious and evidence-informed addition to good health habits, not a replacement for them.
The good news is that the interventions with the best evidence here are all relatively affordable, widely available, and have strong safety profiles. The risk of doing nothing, particularly if micronutrient levels are suboptimal, almost certainly outweighs the small risk of supplementing sensibly.
[1] Nutraceutical Supplementation Effects on Subjective Fatigue Symptoms in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Systematic Review (2025). DOI: 10.7759/cureus.87178 | https://pubmed.ncbi.nlm.nih.gov/40755709/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12315604/
[2] Dietary Supplementation for Fatigue Symptoms in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), A Systematic Review (2025). DOI: 10.3390/nu17030475 | https://pubmed.ncbi.nlm.nih.gov/39940333/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819863/
[3] An investigation into how the timing of nutritional supplements affects the recovery from post-exercise fatigue: a systematic review and meta-analysis (2025). https://pubmed.ncbi.nlm.nih.gov/40352254/
[4] Vitamin and mineral supplements and fatigue: a prospective study (2025). https://pubmed.ncbi.nlm.nih.gov/40053071/
[5] Effects of β-glucans on fatigue: a systematic review and meta-analysis (2025). https://pubmed.ncbi.nlm.nih.gov/39875626/
[6] Mitochondrial dysfunction and chronic disease: treatment with natural supplements (2014). https://pubmed.ncbi.nlm.nih.gov/24473982/
[7] Nutraceutical Supplementation Effects on Subjective Fatigue Symptoms in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Systematic Review (2025). DOI: 10.7759/cureus.87178 | https://pubmed.ncbi.nlm.nih.gov/40755709/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12315604/
[8] Mitochondrial Dysfunction and Chronic Disease: Treatment With Natural Supplements (2014). https://pubmed.ncbi.nlm.nih.gov/26770107/
[9] Benefits of micronutrient supplementation on nutritional status, energy metabolism, and subjective wellbeing (2021). DOI: 10.20960/nh.03788 | https://pubmed.ncbi.nlm.nih.gov/34323089/
[10] Rhodiola rosea for physical and mental fatigue: a systematic review (2012). https://pubmed.ncbi.nlm.nih.gov/22643043/
[11] Natural medicines for the treatment of fatigue: Bioactive components, pharmacology, and mechanisms (2019). DOI: 10.1016/j.phrs.2019.104409 | https://pubmed.ncbi.nlm.nih.gov/31446039/
[12] Vitamins and Minerals for Energy, Fatigue and Cognition: A Narrative Review of the Biochemical and Clinical Evidence (2020). DOI: 10.3390/nu12010228 | https://pubmed.ncbi.nlm.nih.gov/31963141/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7019700/
[13] Integrative Therapies for Cancer-Related Fatigue (2019). DOI: 10.1097/PPO.0000000000000396 | https://pubmed.ncbi.nlm.nih.gov/31567463/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7388739/
[14] Mitochondrial Dysfunction and Coenzyme Q10 Supplementation in Post-Viral Fatigue Syndrome: An Overview (2024). https://pubmed.ncbi.nlm.nih.gov/38203745/
[15] Effect of Dietary Coenzyme Q10 Plus NADH Supplementation on Fatigue Perception and Health-Related Quality of Life in Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Prospective, Randomized, Double-Blind, Placebo-Controlled Trial. DOI: 10.3390/nu13082658 | https://pubmed.ncbi.nlm.nih.gov/34444817/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8399248/
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.
Quick Read EPA and DHA are two different omega-3 fatty acids found in fish oil, and they work differently in
Quick Read CoQ10 is a molecule your body naturally produces that helps cells generate energy, particularly in your brain. Your
