Supplements for seasonal low mood (winter blues)

Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Mood & stress

Mood and energy that dip in the darker months are strongly linked to low vitamin D; testing and correcting it is the key step.

Vitamin D is made in the skin from sunlight, so levels fall in winter at higher latitudes exactly when seasonal low mood appears, and the two are repeatedly linked. Omega-3 supports mood through the year, and morning light exposure is a powerful non-supplement lever.

Nutrients commonly linked

Vitamin D3 + K2
See the guide →
Omega-3 Fish Oil
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.

Vitamin D (25-OH)
When to see a doctor

If winter low mood is severe or recurs every year and affects your functioning, ask a doctor about seasonal affective disorder and light therapy.

Beyond supplements

Get outside in the morning, use a light box if needed, and keep exercise and social plans through winter.

Common questions

What supplements help with seasonal low mood (winter blues)?
Mood and energy that dip in the darker months are strongly linked to low vitamin D; testing and correcting it is the key step. The nutrients most often linked are Vitamin D3 + K2, Omega-3 Fish Oil.
Which deficiencies are associated with seasonal low mood (winter blues)?
Vitamin D is made in the skin from sunlight, so levels fall in winter at higher latitudes exactly when seasonal low mood appears, and the two are repeatedly linked. Omega-3 supports mood through the year, and morning light exposure is a powerful non-supplement lever.
When should I see a doctor about seasonal low mood (winter blues)?
If winter low mood is severe or recurs every year and affects your functioning, ask a doctor about seasonal affective disorder and light therapy.

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.

Analyse my bloodwork →Take the quiz

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.