Why most energy supplement advice ignores the regulations

Search for "supplements for energy" and you will find lists recommending everything from green tea extract to adaptogenic mushrooms. Most of these articles recommend ingredients with no legal basis for energy claims in the UK.

That matters. Under EU Regulation 432/2012, retained in UK law post-Brexit, only specific nutrients can carry authorised health claims relating to energy and fatigue. Everything else is marketing.

This guide covers what the evidence and the regulations actually support.

Which energy claims are legally authorised in the UK?

The UK follows the EU Register of authorised health claims. Two categories of claim are relevant here.

"Contributes to the reduction of tiredness and fatigue"

This claim is authorised for:

"Contributes to normal energy-yielding metabolism"

This claim is authorised for:

These are the only nutrients that can legally carry energy-related claims in the UK. Any supplement making energy claims about ingredients not on this list is operating outside the regulatory framework.

Note: CoQ10, ashwagandha, caffeine, ginseng, and green tea extract are not on either list. We discuss them honestly below.

Iron and energy: the most common nutritional cause of fatigue

If you are experiencing persistent tiredness, the single most evidence-based starting point is your iron status.

Iron contributes to the reduction of tiredness and fatigue — an authorised health claim — because it is essential for oxygen transport via haemoglobin and for mitochondrial energy production. When iron stores are low, cells cannot produce energy efficiently regardless of what other supplements you take.

How common is iron deficiency?

The National Diet and Nutrition Survey (NDNS) shows that iron deficiency remains widespread in the UK:

Iron deficiency causes fatigue even without anaemia

A landmark double-blind, placebo-controlled trial by Verdon et al. (2003) studied 144 non-anaemic women with unexplained fatigue. Those receiving iron supplementation showed a 29% reduction in fatigue scores compared to 13% in the placebo group, with the strongest benefit in women with ferritin levels below 50 mcg/L.

This is significant because it demonstrates that you do not need to be clinically anaemic to experience fatigue from suboptimal iron stores. Many GPs only test haemoglobin, missing the larger population with depleted ferritin but normal haemoglobin.

For a detailed comparison of iron supplement forms and absorption, see our guide to iron supplements: forms, absorption and how to choose.

B vitamins and energy: why the whole complex matters

Seven of the eight B vitamins carry authorised claims for either energy-yielding metabolism or reduction of tiredness and fatigue. This is not coincidental — they function as coenzymes in interconnected metabolic pathways.

As Kennedy (2016) argued in a comprehensive review, research has historically focused narrowly on B12, B9 and B6 through the lens of homocysteine metabolism, while "scant regard has been paid to the other B vitamins." In reality, all eight function synergistically — adequate levels of each are required for optimal cellular energy production.

The key energy pathways

Why isolated B12 is not always the answer

Vitamin B12 is the most commonly supplemented B vitamin for energy. But B12 works in tandem with folate (B9) and B6 in the methylation cycle. If your B6 or folate status is also low, supplementing B12 alone may not resolve fatigue because the metabolic bottleneck is elsewhere.

Tardy et al. (2020) reviewed the biochemical and clinical evidence for vitamins and minerals in energy, fatigue and cognition, concluding that "even marginal deficiency in one or more of these micronutrients may lead to suboptimal metabolism and increased fatigue."

This is why PARTICULAR includes a full B-vitamin complex personalised to your dietary intake, rather than isolated megadoses of a single B vitamin. For a deeper comparison of B12 forms, see methylcobalamin vs cyanocobalamin.

Magnesium and fatigue

Magnesium carries the authorised claim "contributes to the reduction of tiredness and fatigue." It is also authorised for normal energy-yielding metabolism, normal functioning of the nervous system, and normal psychological function.

Magnesium is a cofactor in over 300 enzymatic reactions, including ATP synthesis — the fundamental energy currency of every cell. When magnesium is insufficient, mitochondrial energy production is directly impaired.

Deficiency is more common than you think

The NDNS shows that up to 53% of adolescent girls and 11–16% of adults have magnesium intakes below the LRNI. Factors that deplete magnesium include chronic stress, alcohol consumption, and diets low in green leafy vegetables, nuts, seeds and wholegrains.

If your fatigue overlaps with poor sleep quality, magnesium may be doubly relevant. See our guide to magnesium for sleep for the clinical evidence.

CoQ10: relevant for mitochondrial energy, but the evidence is nuanced

Coenzyme Q10 is not on the EU register of authorised health claims. That means PARTICULAR cannot and does not make energy claims for CoQ10. But the science of what it does is well established.

CoQ10 sits in the inner mitochondrial membrane as a mobile electron carrier in the electron transport chain — the final stage of cellular energy production. Without adequate CoQ10, the chain that converts food into ATP does not function efficiently.

What does the clinical evidence show?

A systematic review and meta-analysis by Tsai et al. (2022) pooled 13 randomised controlled trials (1,126 participants) and found that CoQ10 supplementation was associated with statistically significant fatigue reduction compared to placebo, with stronger effects at higher doses and longer durations.

However, the included studies predominantly examined specific populations — people with chronic fatigue syndrome, fibromyalgia, statin users, and those recovering from illness. The evidence for CoQ10 reducing fatigue in otherwise healthy, well-nourished adults is less robust than for iron or B vitamins.

PARTICULAR includes CoQ10 in personalised formulations where an individual's profile suggests it may be beneficial — not as a blanket "energy ingredient" for everyone.

Ashwagandha: stress-related fatigue, not an energy claim

Ashwagandha (KSM-66®) is not authorised for energy claims under EU regulation. PARTICULAR does not market it as an energy supplement.

What the evidence does show is that ashwagandha may help with the type of fatigue driven by chronic stress. Chandrasekhar et al. (2012) conducted a double-blind, placebo-controlled trial in 64 adults with a history of chronic stress. Those taking 600mg/day of high-concentration ashwagandha root extract showed a 44% reduction in perceived stress scores compared to 5.5% in the placebo group, alongside a 27.9% reduction in serum cortisol levels.

This distinction matters. If your fatigue stems from chronically elevated cortisol — the kind that comes with prolonged work stress, sleep disruption and feeling "wired but tired" — addressing the cortisol response may be more relevant than adding another B vitamin. But this is adaptogen evidence, not a regulatory energy claim, and should be understood as such.

What about caffeine, green tea and ginseng?

These are the ingredients most commonly found in "energy supplements" on the high street. A brief honest assessment:

PARTICULAR does not include stimulants. The goal is to support your body's actual energy metabolism with the nutrients it needs — not to mask fatigue with substances that create dependency.

Why "energy" supplements often disappoint

The fundamental problem with most energy supplements is that they treat "low energy" as a single problem with a single solution. It is not.

If your fatigue is caused by iron deficiency, no amount of B12, CoQ10 or caffeine will resolve it. You need iron.

If your fatigue is caused by chronic stress, adding more B vitamins to an already adequate intake will not help. The bottleneck is cortisol dysregulation, not a vitamin deficiency.

If your fatigue is caused by poor sleep, stimulants make the problem worse. Supporting nervous system function with magnesium may be more appropriate.

If your fatigue is caused by multiple marginal deficiencies, a single-ingredient supplement misses the point. The interconnected nature of energy metabolism means that the weakest link in the chain determines overall output.

This is why personalisation matters. PARTICULAR's questionnaire assesses your diet, lifestyle, stress levels, sleep quality and life stage to identify which nutrients are most likely to be relevant for you — then delivers them as personalised microgranules in one daily scoop.

A generic "energy blend" guesses. A personalised formula targets the actual gaps.

Key takeaways

  1. Only specific vitamins and minerals carry authorised claims for energy and fatigue reduction in the UK — iron, magnesium, B vitamins, vitamin C, copper, manganese and iodine
  2. Iron deficiency is the most common nutritional cause of fatigue, and supplementation reduces fatigue even in non-anaemic women with low ferritin
  3. B vitamins work as an interconnected complex — isolated B12 supplementation may not help if B6 or folate are also insufficient
  4. Magnesium contributes to the reduction of tiredness and fatigue, with widespread suboptimal intake across the UK population
  5. CoQ10 plays a clear role in mitochondrial energy production, but clinical evidence for fatigue reduction is strongest in specific populations rather than the general public
  6. Ashwagandha KSM-66® is not authorised for energy claims but may support stress-related fatigue through cortisol modulation
  7. The cause of your fatigue determines which nutrient will help — this is why a personalised approach outperforms generic energy supplements

Sources cited in this article: