If you feel like you’re constantly running on empty — even after a “decent” night’s sleep — you’re not alone. Fatigue is one of the most common complaints adults have, and it can show up in lots of ways: low energy, brain fog, poor motivation, cravings, irritability, and that mid-afternoon slump that hits like a wall.
Of course, tiredness can have many causes (stress, sleep quality, hormones, workload, illness), and it’s always worth speaking to a healthcare professional if your fatigue is persistent, severe, or new.
But there’s one often-overlooked factor that can quietly drain your energy: nutrient deficiencies.
In this Body by Nature Supplements guide, we’ll break down the most common nutrient gaps linked with low energy, what signs to look out for, and how supplements for fatigue and tiredness can help support your body — alongside the basics like sleep, hydration, and food.
Important note: This article is for educational purposes and isn’t medical advice. If you’re pregnant, have a medical condition, take medication, or suspect a deficiency, get personalised advice and consider a blood test.
Why nutrient deficiencies can make you feel exhausted
Your body creates energy through a series of processes that rely on vitamins, minerals, amino acids, and healthy fats. If you’re low in key nutrients, your body may struggle to:
- Convert food into usable energy
- Support healthy red blood cell production
- Maintain stable mood and focus
- Regulate stress and sleep
- Recover from exercise and daily demands
That’s why the right supplements for fatigue and tiredness often focus on foundational nutrients — not “quick fix” stimulants.
1) Iron: the classic fatigue nutrient (especially for women)
Iron is essential for making haemoglobin, the protein in red blood cells that carries oxygen around the body. When iron is low, less oxygen gets delivered to tissues — and you can feel wiped out.
Common signs that may be linked with low iron include:
- Feeling unusually tired or weak
- Shortness of breath during normal activity
- Pale skin
- Headaches
- Feeling cold more often
Iron deficiency is more common in women (especially with heavy periods), but men can also be affected — particularly with restrictive diets or absorption issues.
Tip: Don’t supplement iron “just in case.” Too much iron can be harmful, so it’s best guided by symptoms and testing.
2) Vitamin B12: energy, nerves, and brain fog
Vitamin B12 supports red blood cell formation and nervous system function. Low B12 can contribute to fatigue, low mood, and brain fog.
You may be at higher risk of low B12 if you:
- Eat little or no animal products
- Have digestive issues that affect absorption
- Take certain medications long-term (speak to a clinician)
If you’re looking for supplements for fatigue and tiredness, B12 is one of the most common “foundation” nutrients people consider — especially when tiredness comes with mental fog.
3) Folate (Vitamin B9): red blood cells and energy metabolism
Folate works closely with B12 and is involved in healthy cell division and red blood cell production. Low folate can contribute to tiredness and weakness.
Folate is found in leafy greens, legumes, and fortified foods — but intake can be inconsistent, especially if your diet is rushed or low in vegetables.
4) Vitamin D: low levels can affect mood and vitality
Vitamin D is best known for bone and immune support, but many people also notice they feel more “flat” when their vitamin D is low.
In the UK, vitamin D deficiency is common, particularly in autumn and winter when sunlight exposure drops.
If you’re building a simple routine of supplements for fatigue and tiredness, vitamin D is often a sensible baseline — especially if you don’t get much midday sun.
5) Magnesium: stress, sleep, and muscle recovery
Magnesium is involved in hundreds of processes, including energy production and nervous system regulation. When life is stressful, sleep is disrupted, or training volume increases, magnesium needs can feel higher.
People often choose magnesium as one of their go-to supplements for fatigue and tiredness because it may support:
- Relaxation and sleep quality
- Muscle function and recovery
- Stress resilience
If your fatigue feels tied to poor sleep, tension, or feeling “wired,” magnesium is worth considering.
6) Omega-3: inflammation balance and brain support
Omega-3 fatty acids support healthy inflammation balance and brain function. While omega-3 isn’t a “direct energy” nutrient like iron or B12, low omega-3 intake can contribute to feeling less resilient — physically and mentally.
Omega-3 is commonly used to support:
- Focus and cognitive performance
- Joint comfort
- Recovery after exercise
- Overall wellbeing
As part of a broader plan, omega-3 can be a smart addition to supplements for fatigue and tiredness.
7) Protein and amino acids: the hidden energy foundation
If you’re under-eating protein, your body may struggle with recovery, muscle maintenance, and stable energy.
Signs you might not be getting enough protein include:
- Feeling sore for days after workouts
- Cravings and snacking that never quite satisfies
- Struggling to maintain strength
A protein supplement can be a practical tool if you’re busy, skipping meals, or not hitting protein targets consistently.
How to tell if a deficiency might be the issue
A key point: fatigue is rarely caused by just one thing.
Ask yourself:
- Has my sleep quality been poor for weeks?
- Am I stressed, overworked, or not recovering?
- Is my diet low in variety (few vegetables, little protein, lots of convenience foods)?
- Do I avoid certain food groups?
- Have I had blood work done recently?
If fatigue is persistent, a simple blood test can be one of the fastest ways to get clarity.
A simple, sensible supplement approach
If you want to try supplements for fatigue and tiredness without overcomplicating things, keep it simple:
- Start with one goal (better energy, better sleep, better focus)
- Choose 1–3 foundational supplements
- Take them consistently for 3–6 weeks
- Track changes (energy, mood, sleep, cravings)
A common “baseline” stack many people start with is:
- Vitamin D
- Magnesium (evening)
- A quality B-complex or B12 (if appropriate)
Then adjust based on your needs — for example, iron only if advised, omega-3 for overall wellbeing, or probiotics if digestion is part of the picture.
Final thoughts
Feeling tired all the time can be frustrating — especially when you’re doing your best to keep up with life. While there’s no single magic pill, addressing nutrient gaps can make a real difference.
The best supplements for fatigue and tiredness support the body’s foundations: oxygen delivery, energy metabolism, nervous system balance, and recovery.