Feeling consistently tired or low on energy is one of the most common reasons people turn to supplements — but the right product depends significantly on why you're tired. Nutritional gaps in B vitamins, iron, vitamin D or magnesium are among the most common contributors to tiredness and fatigue. Stress and poor sleep are another distinct driver, where adaptogenic herbs like ashwagandha and rhodiola are more typically relevant. Understanding which category applies to you makes choosing far more straightforward.
This collection covers both approaches: nutrient-based energy support with authorised health claims, and adaptogenic and botanical products for stress-related fatigue and resilience.
Nutrients That Contribute to Normal Energy Metabolism
Several nutrients carry authorised UK health claims confirming they contribute to normal energy-yielding metabolism and the reduction of tiredness and fatigue:
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B vitamins (B1, B2, B3, B5, B6, B12, folate, biotin) — support the conversion of food into energy at a cellular level
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Iron — essential for oxygen transport; low iron is one of the most common nutritional causes of fatigue, particularly in women
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Magnesium — contributes to normal energy-yielding metabolism and the reduction of tiredness and fatigue
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Vitamin D — contributes to normal muscle function and the reduction of tiredness and fatigue
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Vitamin C — contributes to the reduction of tiredness and fatigue
Adaptogens and Botanicals
Ashwagandha, rhodiola, maca and similar adaptogenic herbs do not carry the same authorised health claims as the nutrients above. They are traditional herbal supplements associated with supporting the body's response to stress and mental fatigue. They are most relevant to those whose tiredness is primarily stress or lifestyle-related rather than a nutritional gap.
For specific ingredient comparisons and guidance on where to start, see the FAQs below.