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Are vitamins in winter important?

Dr Roger Henderson
Reviewed by Roger HendersonReviewed on 29.04.2024 | 9 minutes read

As the days get shorter and the temperature cools, it can be tempting to curl up on the sofa with some comfort food and a binge-worthy box set. But we are not naturally hibernating animals, so it’s important to understand why your energy levels may dip while your appetite increases, and address it with healthy choices.

The doctors at Healthwords will always encourage a healthy balanced diet over and above taking supplements, and the more colourful and varied your meals, the more nourishing nutrients you are getting. But there are times that supplements may be helpful or even vital. There is less choice of fresh foods over winter, and less sunshine to naturally make vitamin D, plus fighting off colds and flu means our immunity needs to be in tip-top condition.

Let's talk you through the challenges of winter and how to counter them to keep you healthy in mind and body.

Doctor’s advice

Causes & triggers

Too little sunshine

Sunshine is thought to bring us happiness by boosting production of the feel-good neurotransmitter, serotonin. With depleted levels, it’s thought that this contributes to a low mood. Sunlight also regulates production of melatonin, a hormone known to induce sleep. Less sunshine means more melatonin, and hence potentially more lethargy and over-sleeping in the winter.

Vitamin D deficiency

We get most of our vitamin D from sunlight, so the darker days of winter mean we risk becoming deficient. It’s thought that vitamin D boosts serotonin levels, which work in the brain to elevate mood, so this may also play a role in the winter blues. It’s recommended that everyone takes a supplement through the winter, to benefit bones, teeth, muscles and mood. Those spending lots of time indoors or of darker skin colour should take one all year round. Certain foods also contain vitamin D, like oily fish, liver, egg yolks or fortified cereals, but you’d have to eat a lot of them to get enough to compensate for winter sunlight levels.


SAD (seasonal affective disorder), is a known phenomenon akin to depression, that starts in autumn and builds as the winter comes. This can cause a persistent low mood, feelings of despair, worthlessness or hopelessness, lack of concentration and motivation, lack of usually enjoyable activities, irritability and increased sleepiness. This is related to a lack of sunshine, but the exact mechanism isn’t well-understood – it may involve a reduction of serotonin, disruption to your circadian rhythm which controls your sleep-wake cycle, and possibly increased melatonin. It doesn’t affect everyone to the same extent, some may get a mild version, for others it can be quite debilitating.

Too few fruit and veg

There's plenty of juicy bright fruit and vegetables in the harvest of summer, bringing us lots of vitamins and minerals, but the choices are less appealing in winter, and don't contain the same abundance of nutrients. So we have to work harder to get nutrients from our diet, and many of the fruit and vegetables need to be cooked or flavoured in other ways to appear palatable.

Craving comfort foods

We tend to seek more comfort food in winter like pasta, bread, pastries, biscuits and chocolate. These sugar-rich or carb-heavy foods make you feel full and satisfied for a short while, but also more sleepy and lethargic while your body diverts energy from brain activities like thinking and planning, towards digesting instead. Swings of sugar from high to low can also disrupt our mood and sleep.

Less active

It’s much easier to stay active in summer, when it’s warm, dry and light in the mornings and evenings, but harder to motivate ourselves to exercise in the winter, especially outdoors. This may have something to do with our circadian rhythms, our sleep-wake cycle that finds it hard to be active at darker times of the day.


It’s a myth to say that our metabolism goes down in winter – this is only true for hibernating animals – that’s bears, not us. But there’s an argument to say that we need more calories to generate warmth in the cold months, and this may explain our quest for carbs.

Increased immune requirements

Viruses thrive in the autumn and winter, doing best in the cold weather and while we're in close proximity spending time indoors. Children going back to school or nursery in the autumn term heralds the start of the coughs and colds season, and flu season starts mid-autumn, with COVID-19 as a new recruit to the advent of viral illnesses.

Low mood or depression

Aside from SAD, many suffer a dip in their mood for a combination of the factors above – missing the sunshine, feeling lethargic and a lack of activities compared to warmer months. This can all add to a sluggish feeling during the winter.

Treatment: home & drug-free

Vitamin D: It’s recommended that everyone takes a supplement through the winter, to benefit bones, teeth, muscles and mood, and those spending lots of time indoors or of darker skin colour should take one all year round.

Vitamin B family: Vitamin B6 is thought to boost serotonin levels, so without enough onboard, we run the risk of depression. In older people, vitamin B12 helps with cognitive function and runs low in those with Alzheimer’s disease and dementia, which suggests boosting this may help. It also suggests the role vitamin B may play in brain function, but we haven’t discovered everything yet.

Magnesium: If winter brings you low energy levels and low mood to match, research has suggested magnesium may help improve your mood, although more research is needed to say it’s a strong link. It’s hard for our bodies to fully use magnesium when taken by mouth, but topical treatments such as salts dissolved in baths can be a useful source of magnesium. If nothing else, a lovely relaxing bath may be just the ticket to help you unwind and get a good night’s sleep.

Vitamin C is essential for a healthy immune system, working as an anti-oxidant to fight infection and inflammation, and it helps us to absorb iron from food sources. It also stimulates collagen to help maintain strong bones and build firm, elastic skin and healthy hair. It’s found in abundance in the summer, with fresh fruit and vegetables like berries, citrus fruits, peppers, potatoes and leafy green vegetables all readily available. But we can’t store it, so some turn to supplements in the winter to maintain levels.

Zinc: Known as a trace element as you only need a tiny amount, this is needs to support cells to build good immunity, it may cold symptoms, and it helps regulate blood sugar levels by processing carbohydrate, fat and protein from food. It’s found naturally in red meat, cheese, shellfish and bread.

Iron: Various factors mean that winter may cause a dip in iron levels, which can affect your health if you are already mildly anaemic for other reasons. Many sources of iron come from the leafy green vegetables of summer, which vegetarians and vegans will be especially reliant on as they can’t source their iron from red meat or diary. In addition, vitamin C helps absorb iron, and natural sources of this are in short supply in winter. So it may be worth topping up iron levels with a supplement, especially if you know you are vulnerable, such as excluding certain food groups or women who are pregnant or have heavy menstruation.

A lightbox: If you’re missing the sunshine and think you might suffer from SAD, a light box can make all the difference. This aims to mimic the effect of sunlight, delivering an ambient, warm light. It’s recommended to spend 30 and 60 minutes exposure a day is all that’s needed to boost your serotonin levels and counter the effects of melatonin, helping to make you feel more balanced.

Sleep patterns: While winter brings many reasons to sleep in for longer, try to resist this temptation and maintain a constant sleep-wake routine. This makes it easier to transition between seasons and help maintain good energy levels, balanced mood and consistent appetite.

Melatonin supplements: If insomnia creeps in, there are many ways to address this through a good sleep hygiene and daytime routine of exercise and mealtimes. Many wonder if melatonin supplements are the answer to help a restful sleep, but these aren’t routinely prescribed in the UK, except in exceptional circumstances such as children with behavioural disorders.

Outdoor exercise: Regular exercise is a good way to get keep energy levels pumped through winter, with added benefits to mood, eating and sleeping routines. A healthy fit body also help keep you and your airways in prime condition to fight off coughs and colds. If you can manage your workout outside, you’re also getting a nourishing dose of fresh air and sunshine that your body craves.

Mental health: Our urge to hunker down and stay warm and dry inside coincides with great TV scheduling and new releases, and maybe carb-heavy comfort food to boot. But it’s important to find motivation to nurture your mental health, too. You may know what works for you, but many people find daily meditation, mindfulness, yoga or even a walk in the park noticing the season’s changes, gives them a boost of energy and a feeling of balance and wellness in the gloom of winter. Planning events and having things to look forward to can also keep our spirits up, even if it's not quite the Caribbean holiday we would love.

When should I see my doctor?

We recommend getting the flu and COVID-19 vaccines – these usually get offered in the early autumn, and they are considered very safe and effective to protect you from the respiratory illness these viruses can cause. People of certain ages or with certain medical conditions will be invited via the NHS, and for others, flu vaccines are available to purchase from local pharmacies.

If you have a fever, you're coughing up thick green sputum and you're finding it difficult to breathe, this could be a bacterial pneumonia that requires antibiotic treatment. You are at higher risk of severe disease if you have asthma, COPD, smoking or other long-term medical conditions, or you are over 65, and you should seek urgent help from your doctor, or the Emergency Department if out of hours.

If you have reason to believe you may be low in certain vitamins or minerals – you are finding exercise much harder than usual like being out of breath climbing a flight of stairs, if people say you look very pale, if you feel excessively fatigued or are sleeping much more than usual, or if your appetite or weight has changed – you should visit your doctor to discuss this. They will ask about symptoms and can send you for blood tests to check for anaemia, reduced iron, vitamin D or B vitamins, and they can check your thyroid function – these may be related to winter or they may be coincidental.

If you're feeling depressed and this is affecting your work life, studies or personal relationships, and it hasn’t shifted with simple lifestyle measures over several weeks, this may be cause to book an appointment with your doctor and talk through symptoms, signs and options going forward. They may suggest a psychological intervention, such as cognitive behavioural therapy (CBT), or certain medications such as antidepressants.

If you have thoughts of harming yourself or suicide, you must seek help as soon as possible. You can tell a trusted friend or relative, but you should also access professional services, such as an urgent appointment with your GP, the mental health Crisis Team if you’re already known to them, or the Emergency Department if out of hours.

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Dr Roger Henderson
Reviewed by Roger Henderson
Reviewed on 29.04.2024
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