Supplements for tired even after a full night's sleep

Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Energy & fatigue

Feeling unrefreshed despite enough sleep often points to low iron, vitamin D, B12, or a thyroid or blood-sugar issue rather than a sleep-quantity problem.

If you sleep enough hours but still wake exhausted, the cause is frequently metabolic rather than behavioural: low ferritin (iron stores), low vitamin D, or an underactive thyroid all blunt daytime energy, and CoQ10 supports the mitochondria that produce it. Poor sleep quality from undiagnosed sleep apnoea is also common and is not fixed by supplements.

Nutrients commonly linked

Iron Bisglycinate
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Vitamin D3 + K2
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Methyl-B12
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Magnesium Glycinate
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CoQ10
See the guide →

Biomarkers worth checking

These are the blood tests most relevant here. Knowing your numbers tells you whether a supplement is the right answer.

FerritinVitamin D (25-OH)TSHVitamin B12
When to see a doctor

If you snore loudly, stop breathing in your sleep, or feel sleepy enough to nod off during the day, ask your doctor about sleep apnoea and thyroid testing rather than self-treating.

Beyond supplements

A consistent wake time, morning daylight, and limiting alcohol and late screens improve sleep quality more than supplements.

Common questions

What supplements help with tired even after a full night's sleep?
Feeling unrefreshed despite enough sleep often points to low iron, vitamin D, B12, or a thyroid or blood-sugar issue rather than a sleep-quantity problem. The nutrients most often linked are Iron Bisglycinate, Vitamin D3 + K2, Methyl-B12, Magnesium Glycinate, CoQ10.
Which deficiencies are associated with tired even after a full night's sleep?
If you sleep enough hours but still wake exhausted, the cause is frequently metabolic rather than behavioural: low ferritin (iron stores), low vitamin D, or an underactive thyroid all blunt daytime energy, and CoQ10 supports the mitochondria that produce it. Poor sleep quality from undiagnosed sleep apnoea is also common and is not fixed by supplements.
When should I see a doctor about tired even after a full night's sleep?
If you snore loudly, stop breathing in your sleep, or feel sleepy enough to nod off during the day, ask your doctor about sleep apnoea and thyroid testing rather than self-treating.

Explore further

Find out what's actually low

Upload your bloodwork and we'll read the relevant markers, or take the quiz for a personalised stack.

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Educational use only, not medical advice, diagnosis, or treatment. Symptoms have many possible causes, and the nutrients here are commonly associated with this symptom, not a guaranteed fix. Always consult a qualified clinician, especially if symptoms are severe, persistent, or new.