The Best Supplements for Energy UK: A Doctor's Ranked List

The supplement market is full of products claiming to boost energy. Most of them are caffeine in a capsule. Here's my honest, evidence-ranked assessment of which supplements genuinely support energy at a biological level.

1. NMN (Nicotinamide Mononucleotide) — Best for Cellular Energy

NMN tops my list because it addresses energy at the most fundamental level — cellular energy production via NAD+. Rather than stimulating your nervous system like caffeine, NMN supports your mitochondria to produce ATP more efficiently. The result is a sustained, clean energy improvement without the crash or dependency of stimulants.

Best for: Adults over 35 experiencing declining energy levels, those wanting long-term metabolic support.

Shop NMN Pure →

2. Shilajit Complex — Best for Vitality and Stamina

Himalayan Shilajit has centuries of use for energy and vitality, and the modern science supports it. Its dibenzo-alpha-pyrones support mitochondrial function directly, while fulvic acid enhances cellular nutrient uptake. Our Shilajit Complex adds Lion's Mane, Ashwagandha, Reishi and Maca for comprehensive energy and stress resilience support.

Best for: People dealing with physical fatigue, stress-related energy depletion, or wanting broader adaptogenic support.

3. Magnesium Glycinate — Best for Fighting Fatigue

Magnesium deficiency is one of the most common and overlooked causes of fatigue in the UK. Magnesium is a cofactor in over 300 enzymatic reactions, including those in the Krebs cycle that produce cellular energy. If you're deficient — and surveys suggest up to 70% of UK adults are — no amount of NMN will fully compensate.

Best for: Anyone experiencing fatigue, poor sleep, muscle weakness or cramps. Essential as a foundation supplement.

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4. NAD+ Complex — Best for Comprehensive NAD+ Support

For those who want maximum NAD+ support, our NAD+ Complex combines Liposomal NAD+, Nicotinamide Riboside, Trans-Resveratrol and Magnesium Glycinate in one formula. It's the most comprehensive single supplement for cellular energy on our range.

5. B Vitamins (Dietary)

Worth mentioning: B vitamins (B2, B3, B6, B12) are essential cofactors in energy metabolism. Most people get adequate B vitamins from diet, but vegans and older adults are at higher risk of deficiency — particularly B12. Address dietary gaps before adding supplements.

What Doesn't Make the List

Caffeine-based "energy" supplements. They work short-term but mask underlying fatigue, disrupt sleep (which worsens energy), and create dependency. They don't address the root cause of energy decline in any meaningful way.

Shop the Vital Energy Trio — NMN, Shilajit and Magnesium bundle →

Written by Dr Chun Tang, MBChB, MRCGP — founder of Little Ox and practising UK GP.