Feeling tired all the time is something many people struggle with, especially during busy, stressful or demanding periods of life. While sleep, stress, hydration and lifestyle habits all play an important role in energy levels, nutrition can also have a significant impact on how you feel day to day.
However, if you're experiencing persistent tiredness and fatigue, it’s important to speak with your GP or healthcare professional to rule out underlying medical causes such as iron deficiency anaemia, coeliac disease, an underactive thyroid or other health conditions that may require treatment.
Once these have been addressed or ruled out, it can be helpful to take a closer look at your sleep, stress levels, nutrition, hydration and recovery habits.
Low levels of key nutrients such as magnesium, vitamin B12, vitamin D and iron can contribute to tiredness and fatigue, particularly during periods of increased stress, busy schedules or when your diet isn't providing enough of these essential nutrients.
At Supplements Made Simple, Dr. Doireann created the brand to help make supplements feel less confusing, with evidence-based products designed to support real people and real lifestyles.
If you’re struggling with low energy levels, understanding which nutrients support energy production may be a helpful place to start.
Why am I always tired?
Tiredness and fatigue can happen for many different reasons, including:
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Poor sleep quality
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High stress levels
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Low intake of essential vitamins and minerals
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Busy lifestyles and lack of recovery time
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Low iron, vitamin D or vitamin B12 levels
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Inadequate nutrition or undereating
In many cases, fatigue is not caused by one single issue, but rather a combination of lifestyle, stress and nutritional factors working together.
Best supplements for tiredness & fatigue
Magnesium for tiredness & fatigue
Magnesium is involved in hundreds of processes within the body, including energy production, muscle function and nervous system support. It’s also one of the most commonly overlooked nutrients when it comes to low energy levels and stress.
Magnesium contributes to a reduction of tiredness and fatigue, electrolyte balance, normal functioning of the nervous system, normal muscle function and normal psychological function.
Magnesium may be particularly beneficial for people experiencing poor sleep, muscle tension, stress or feeling constantly run down.
Vitamin B12 for energy levels
Vitamin B12 plays an important role in red blood cell formation, nervous system function and energy production. Low levels of vitamin B12 may contribute to persistent fatigue and low energy, particularly in those following vegetarian or vegan diets, or those eating very little animal-based foods.
Vitamin B12 contributes to the reduction of tiredness and fatigue, normal psychological function, normal functioning of the nervous system and normal red blood cell formation. If you’d like to learn more on the role of vitamin B12 you can read our blog post.
Vitamin D & fatigue
Vitamin D deficiency is extremely common in Ireland, particularly during autumn and winter months when sunlight exposure is reduced. Low vitamin D levels may contribute to fatigue, low mood and reduced immune function.
Vitamin D contributes to the normal function of the immune system and the maintenance of normal bones, muscles and teeth.
Iron & low energy
Iron plays a critical role in transporting oxygen around the body. Low iron levels can lead to iron deficiency anaemia, which is one of the most common nutritional causes of fatigue and low energy.
If you are experiencing persistent tiredness, dizziness, shortness of breath or ongoing fatigue, it’s important to speak with your GP or healthcare professional before supplementing with iron, as blood testing may be needed.
Omega-3 Fish Oils
Omega-3 fatty acids help support overall wellbeing, including heart, brain and eye health. While omega-3 supplements are not directly linked to reducing tiredness and fatigue, they may help support focus, mental clarity and general wellbeing.
EPA and DHA contribute to the normal function of the heart, while DHA contributes to normal brain function and maintenance of normal vision.
How to choose the right supplements
The best supplements for tiredness and fatigue will depend on the underlying cause.
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If you feel physically drained or run down, magnesium may help support energy production and muscle function
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If you feel mentally fatigued or low in concentration, vitamin B12 may be beneficial
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If fatigue feels worse during winter months, vitamin D may be worth considering
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If fatigue is persistent or severe, it’s important to speak with your healthcare professional and consider blood testing
In many cases, supporting energy levels involves a combination of nutrition, sleep, stress management and consistent daily habits.
Lifestyle habits that support energy levels
Supplements can help support energy levels, but they work best alongside supportive lifestyle habits such as:
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Consistent sleep
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Eating balanced meals regularly
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Staying hydrated
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Managing stress levels
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Daily movement and recovery time
Fatigue is rarely caused by one single factor, which is why taking a balanced, realistic approach is so important.
When should you take supplements for fatigue?
Most supplements for tiredness and fatigue can be taken daily as part of a consistent routine.
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Magnesium is commonly taken in the evening
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Vitamin B12 is often taken in the morning
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Vitamin D is typically taken alongside food
Consistency matters far more than perfect timing, and it can take time to notice the benefits of nutritional support.
Supporting your energy levels long-term
Feeling tired occasionally is normal, but ongoing fatigue shouldn’t be ignored. Supporting your body with the right nutrients, alongside sleep, nutrition and stress management, can help support energy levels and overall wellbeing over time.
At Supplements Made Simple, the goal has always been to make supplements feel more straightforward and less overwhelming, helping you choose products that genuinely fit your lifestyle and individual needs.
Your tiredness & fatigue questions, answered
What is the best supplement for tiredness and fatigue?
Some of the most commonly recommended supplements for tiredness and fatigue include magnesium, vitamin B12 and vitamin D, depending on the underlying cause of low energy levels.
Does magnesium help with fatigue?
Yes. Magnesium contributes to normal energy-yielding metabolism and helps reduce tiredness and fatigue.
Can vitamin B12 help support energy levels?
Vitamin B12 contributes to the reduction of tiredness and fatigue, while also supporting normal red blood cell formation and nervous system function.
Why am I tired all the time even after sleeping?
Persistent fatigue can be linked to many different factors, including stress, poor sleep quality, low iron, vitamin D deficiency, inadequate nutrition or underlying health conditions. If fatigue is ongoing, it’s important to speak with your healthcare professional.
Taking the next step
Low energy can often build up gradually, especially when stress, poor sleep, busy schedules and inadequate nutrition begin to overlap. Because of this, addressing fatigue is rarely about finding one “magic” supplement. Instead, it’s often about taking a step back and looking at the bigger picture of your overall health and wellbeing.
For some people, low levels of nutrients such as magnesium, vitamin B12, vitamin D or iron may also be contributing to how they feel. In these cases, targeted supplementation may help support energy levels alongside a balanced diet and healthy lifestyle.
At Supplements Made Simple, we believe supplements should be simple, evidence-based and designed to support real life. If you’re looking to support your energy levels, you can explore the full Supplements Made Simple collection here.
