Supplements for Energy and Stamina: Men's UK Guide (2026)

By Jordan Harvey · 23 July 2026 · Updated 23 July 2026 · 11 min read

If you're a man over 40 and your energy isn't what it used to be, you're not imagining it. Age-related decline in mitochondrial function, gradual testosterone reduction, reduced stomach acid (which lowers absorption of B12, zinc, iron, and magnesium), and chronic low-grade inflammation all converge to chip away at daily stamina. The good news: a small set of supplements has genuine clinical evidence behind them — including some with EFSA-approved health claims. A 2016 meta-analysis of 12 RCTs (n=630) (Bach et al., JKMS, 2016) reported lower fatigue scores in the Panax ginseng groups (SMD 0.34, p<0.001) at trial doses of 200mg–2g/day — far above Blue Power’s dose; that finding cannot be transferred to Blue Power as a label claim (Bach et al., 2016).

This guide ranks the supplements that actually have evidence behind them, separates EFSA-approved claims from marketing copy, and covers what's worth skipping — including some popular options that EFSA explicitly rejected for energy claims.

What Causes Low Energy in Men Over 40?

Several biological shifts compound after 40. Mitochondria — the cellular structures that produce ATP — become less efficient with age, generating less energy and more oxidative byproducts. Testosterone declines roughly 1–2% per year, and lower testosterone is consistently associated with reduced motivation and exercise capacity. Stomach acid production drops with age, reducing absorption of B12, zinc, iron, and magnesium — all of which feed energy metabolism. Sleep architecture shifts, with less deep restorative sleep regardless of total hours in bed. And chronic low-grade inflammation (sometimes called "inflammaging") diverts metabolic resources away from energy production.

Supplements can address several of these levers simultaneously: nutrients for the absorption gap, adaptogens for the HPA axis, mitochondrial cofactors for ATP synthesis, and ingredients with EFSA-approved fatigue claims. The aim isn't a stimulant rush; it's a baseline rebuild.

What Are the Most Evidence-Backed Energy Supplements for Men?

1. Vitamin C EFSA-Approved Fatigue Claim

Vitamin C is the cleanest entry on this list because it has a direct EFSA-approved health claim: "Vitamin C contributes to the reduction of tiredness and fatigue" (EU Regulation 432/2012, Claim IDs 139, 2622).

The two energy-relevant EFSA-authorised vitamin C claims are: Vitamin C contributes to the reduction of tiredness and fatigue. Vitamin C contributes to normal energy-yielding metabolism. Dose: 80mg/day = 100% NRV, achievable through diet (one large orange ~70mg) but more reliably via daily supplementation. Smokers, heavy exercisers, and men with limited fruit/vegetable intake are most likely to be at the lower end of intake.

2. Korean Ginseng Trial Evidence

Korean Ginseng (Panax ginseng) is one of the most-studied botanical ingredients in relation to fatigue. In Bach (2016), a meta-analysis pooling 12 RCTs (n=630), lower fatigue scores were reported in the Panax ginseng groups (SMD 0.34, 95% CI 0.16–0.52) (Bach et al., JKMS, 2016). In Li (2022), a further independent meta-analysis of 12 RCTs, a similar effect size was reported for disease-related fatigue (SMD 0.33) (Li et al., Front Pharmacol, 2022).

The active compounds are ginsenosides, which are studied in relation to mitochondrial function, glucose uptake, the HPA stress axis, and inflammatory markers. In the Kim 2013 PLOS ONE trial, 1–2g/day for 4 weeks was associated with anti-fatigue effects versus placebo (Kim et al., 2013); this trial dose is far above Blue Power's and the finding cannot be transferred to Blue Power as a label claim. Dose: Clinical trials used 200mg–2g/day. A 5:1 concentrated extract at 100mg is roughly equivalent to 500mg standard ginseng.

Study Funding Transparency

The energy-supplement literature is a mix of academic, government, and industry funding. The strongest individual signals come from independent meta-analyses:

3. Maca Root Research Overview

Maca Root has been studied in relation to physical-performance markers and mitochondrial biology; the proposed mechanisms differ from ginseng's, with interest in mitochondrial biogenesis (the creation of new mitochondria) and central nervous system signalling. In Stone et al. (2009), a pilot study in 8 trained cyclists, a significant improvement in 40km cycling time-trial was reported in the maca group (p=0.01) at the doses used in that trial (Stone et al., J Ethnopharmacol, 2009). That trial dose (1,500–3,000mg/day standard powder) is far above Blue Power’s 50mg extract; the finding cannot be transferred to Blue Power as a label claim.

In Shin (2023), an RCT (n=80) in men with late-onset hypogonadism symptoms, improved AMS (Ageing Males’ Symptoms) scores — which include energy and fatigue domains — were reported in the maca group alongside IIEF and IPSS improvements (Shin et al., 2023). Holgado et al. (2023) tested 5g/day of black maca extract in 44 elite athletes and reported improved physical fitness markers, lower inflammation, and improved mitochondrial biogenesis over 8 weeks (Holgado et al., 2023). Dose: 1,500–3,000mg/day standalone; 50mg concentrated extract in multi-ingredient formulas as a contributing pathway.

4. Shilajit Research Overview

Dibenzo-alpha-pyrones (DBPs) found in shilajit have been studied in relation to mitochondrial electron transport and ATP processes. In Keller et al. (2019), a placebo-controlled trial, men taking 500mg/day of purified shilajit for 8 weeks were associated with 9.1% muscle strength decline during fatiguing exercise vs 15.7% with placebo — a 42% difference in fatigue resistance markers (Keller et al., 2019). This 500mg trial dose is far above Blue Power's 50mg; the finding cannot be transferred to Blue Power as a label claim.

Shilajit's fulvic acid has also been studied in relation to CoQ10 uptake and mitochondrial membrane integrity. An animal model of chronic fatigue syndrome found shilajit was associated with preserved mitochondrial function and modulated HPA axis activity (Surapaneni et al., 2012). Among the ingredients reviewed here, shilajit has been studied in the context of objective fatigue-resistance markers in addition to subjective scales.

5. Iron EFSA Claim — Test First

Iron has an EFSA-approved claim: "Iron contributes to the reduction of tiredness and fatigue" (Claim IDs 255, 374, 2889) and contributes to normal energy-yielding metabolism. The mechanism is unambiguous — iron is essential for haemoglobin and oxygen transport.

What About CoQ10 and Caffeine?

CoQ10: The 2022 Kuo meta-analysis pooled 13 RCTs (n=1,126) and reported significant fatigue reduction (Hedges' g −0.398, p=0.001) in a dose-dependent manner (Kuo et al., 2022). The clinical evidence exists. However, EFSA rejected all health claims for CoQ10 related to energy and endurance (EFSA Journal 2010;8(10):1793). The mismatch is real: clinical effect appears modest but consistent; regulatory bar wasn't met.

Caffeine: EFSA-approved for "increase in endurance performance" and "increase alertness." It works, but it's a stimulant masking fatigue rather than rebuilding capacity. For sustained daily energy in men over 40, the supplements above address upstream mechanisms (cofactor adequacy, mitochondrial health, hormonal balance) rather than overriding the perception of tiredness.

Energy Supplement Forms & What to Look For

How Men Over 40 Approach Energy: Diet, Lifestyle and Supplement Research

Sleep, diet, exercise, and alcohol intake are upstream of any supplement. Research consistently shows these lifestyle foundations matter more than any individual nutrient. The typical order of priority:

• Sleep: Chronic poor sleep degrades energy more than any supplement can recover. Aim for consistent sleep timing before adding anything else.
• Diet: A varied diet with adequate protein, vegetables, and whole foods addresses most micronutrient shortfalls that contribute to low energy.
• Exercise: Regular moderate exercise improves mitochondrial density and hormonal balance over time — independent of supplementation.
• Alcohol: Even moderate regular alcohol impairs sleep architecture and testosterone; reducing intake often produces a faster energy improvement than supplements.
• Supplementation: The ingredients reviewed above — Vitamin C, Korean Ginseng, Maca and Shilajit — each have their own research base; see the relevant sections of this guide. Vitamin C carries the EFSA fatigue and energy-metabolism claims. The others have clinical trial evidence discussed in their respective sections.
• If on statins: CoQ10 100–200mg/day — reasonable case despite EFSA rejection.
• If GP-confirmed iron deficient: Iron 14mg + Vitamin C to enhance absorption.

Is It Safe to Combine Energy Supplements?

At standard daily doses, the supplements above are well-tolerated and have minimal interaction with each other. The main practical cautions:

• Korean Ginseng + anticoagulants (warfarin, DOACs): Mild theoretical interaction; speak to GP if on blood thinners
• Iron + zinc, calcium, coffee: Compete for absorption — separate timings if both are needed
• Shilajit + iron: Shilajit naturally contains iron; men with haemochromatosis should avoid both
• CoQ10 + warfarin: May reduce warfarin efficacy; monitor INR if combining
• Caffeine + ginseng or maca: Compounded mild stimulation; reduce coffee intake if you notice over-stimulation

Blue Power: Formula Overview

Blue Power is not a stimulant formula. For men who prefer a single daily tablet rather than managing several separate supplements, the formula combines the ingredient categories reviewed in this guide in one product. Food supplement; not a medicine. Individual results vary.

Frequently Asked Questions About Energy & Stamina Supplements

The Bottom Line: How Should Men Over 40 Approach Energy Supplements?

Sleep, diet, exercise, and alcohol intake are upstream of any supplement. Get those right first; supplements work best on a foundation that doesn't sabotage them. Beyond that, the ingredients with the most research interest in the energy and fatigue area are Vitamin C (which carries the EFSA fatigue and energy-metabolism claims), Korean Ginseng, Shilajit, and Maca — each covered with its trial evidence in the sections above.

Skip the energy proprietary blends with hidden doses. Skip caffeine-based "energy formulas" that just stack stimulants. And don't stack iron without testing first. Lifestyle factors matter most; beyond those, the ingredients reviewed here each have their own research base. Blue Power combines several of them — Vitamin C, Korean Ginseng, Maca, Shilajit, and Zinc — at transparent doses in one daily tablet.