You know the scene by heart: the film credits are rolling, you've already zoned out, and the next morning you say 'tired' before anyone has asked you anything. But that little phrase, repeated every day, isn't a mood or a fact of life. It's a signal your body is sending, and it's better to listen to it than to drown it out.

Physical fatigue: a debt you can repay

After a workout, a house move or a week spent rushing around, what you feel is almost ordinary: your muscles have worked, cramps and stiffness creep in, your legs ache. This is the healthiest form of fatigue, the kind that repairs itself. The ritual comes down to three things — a warm bath (not hot, which would leave you even more exhausted), a proper night's sleep, and two or three quieter days if the effort lasted. On your plate, go for whole grains, a source of protein at every meal and water regularly throughout the day, not three glasses gulped down at 10pm. The sign that you're on the mend? The urge to move comes back on its own.

Bowl of whole grains and pulses on a light oak table by a window, with a jug of water
After exertion, a body asking simply to recover

Nervous fatigue: the kind sleep doesn't repair

This one is a different story. You sleep eight hours and wake up drained. Concentration falls to pieces, appetite becomes unpredictable, irritability rises, your complexion looks dull. Your nervous system is running on overdrive, and rest alone isn't enough to calm it. Mental overwork, the mental load, screens until midnight, stress that settles in: these are risk factors, not a single cause. That's the real difference from muscular fatigue — here, recovery alone won't put you back on an even keel. And if it drags on for several weeks, it's no longer a question of organisation: it becomes a reason to see your GP.

A simple notebook like this is worth more than any improvised diagnosis, and it makes a GP appointment far more useful.

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Unmade bed in the morning, crumpled linen sheets and a glass of water on the bedside table, soft light
Eight hours' sleep, and still no energy on waking

The habits that change everything

The move that changes everything isn't a product, it's consistency: a stable bedtime, a daily walk even if it's short, daylight in the morning. In truth, no skincare routine can make up for broken sleep, however expensive it is.

Then comes skincare, and here we stay modest. A few drops of true lavender essential oil in a warm bath can help you relax, provided you dilute it first in a carrier oil — and knowing it's not recommended during pregnancy, breastfeeding or for young children. Magnesium, for its part, has an authorised health claim in the UK: it contributes to the reduction of tiredness and fatigue. In terms of form, magnesium bisglycinate is generally considered better tolerated; magnesium citrate can also have a laxative effect in some people. For your complexion, there's no magic formula: sleep, water, and SPF in the morning.

Young woman walking in a park early in the morning, beige coat and trainers, golden light through the trees
A daily walk, even a short one: the habit that changes everything

When to see a doctor

Fatigue that persists despite decent nights, weight or appetite loss, widespread aches, a lingering fever: head to your GP. They can prescribe a blood test — full blood count, iron studies, TSH, blood glucose — and look for a cause: anaemia, infection, thyroid problems, inflammation. Nothing here replaces that appointment. Follow-up is the only way not to miss something else, and that's prevention too.

Young woman sitting in a bright waiting room, a notebook on her lap, in calm natural light
Fatigue that lasts deserves an appointment, not an improvised diagnosis

Budget

  • Magnesium (citrate or bisglycinate), one month's supply: expect around £8 to £22 at a pharmacy or health food shop. The price rises with the form chosen, the elemental dose and the number of capsules; supermarkets are often cheaper, premium brands more expensive.
  • Organic true lavender essential oil, 10 ml: £7 to £16 in a health food shop or pharmacy. Check the Latin name (Lavandula angustifolia) and an organic certification such as Soil Association or Ecocert, which covers how it is grown, not how it is used. An amber glass bottle protects the contents better, a small bonus for keeping it fresh.
  • GP appointment: free at the point of use on the NHS. If you choose to see a private GP, expect around £50 to £120.
  • No purchase needed: a fixed bedtime and a daily walk. The best value in the whole lot, by far!

Sources

  • NHS — 'Tiredness and fatigue': causes and when to seek help.
  • Great Britain Nutrition and Health Claims Register — authorised health claims, including the link between magnesium and the reduction of tiredness and fatigue.
  • MHRA — safety information and precautions for essential oils and aromatherapy products.
  • Food Standards Agency — guidance on nutrition and health claims.