If you live in the UK, vitamin D deserves more attention when autumn arrives.
From October to early March, sunlight in the UK is not usually strong enough for the body to make enough vitamin D through the skin. UK guidance therefore advises adults and children over 4 to consider taking 10 micrograms of vitamin D per day during autumn and winter.
If you already take a multivitamin, check the label before adding a separate vitamin D supplement. Yumi Nutrition's All Day Energy Gummies provide 10 micrograms of vitamin D in the recommended two-gummy serving, alongside vitamins A, C, E, B6, niacin and biotin.
If you want a more detailed explanation of dosage, gummy formats and safety, you can also read our Vitamin D Gummies: Effectiveness, Dosage & Safety Guide.
The goal is not to take the highest dose you can find. It is to understand how much vitamin D you need, where it comes from and whether you are already getting it elsewhere.
Why Is Vitamin D Important in Winter?
Vitamin D is unusual because your body can make it when sunlight reaches your skin.
During spring and summer, sunlight can make a meaningful contribution to vitamin D levels.
During autumn and winter, that changes.
From around October to early March, the sun is too low in the UK sky for most people to make enough vitamin D through their skin.
That means your main sources become:
- food
- fortified foods
- supplements
This does not mean your body suddenly needs more vitamin D in October.
It means your main source changes.
That is why vitamin D is one of the few nutrients with clear seasonal supplementation advice in the UK.
How Much Vitamin D Do You Need?
For most adults in the UK, the recommended daily amount is:
10 micrograms
You may also see this written as:
400 IU
These are the same amount.
During autumn and winter, adults and children over 4 should consider taking this amount through a supplement because sunlight is no longer a reliable source.
Before adding a new bottle to your routine, check what you already take.
A multivitamin such as All Day Energy may already provide the vitamin D you are looking for.
This is why reading the nutritional panel matters more than simply buying another product labelled "vitamin D".
Is 10 Micrograms of Vitamin D Enough?
For most adults following standard UK guidance, yes.
The recommended amount is 10 micrograms per day.
More is not automatically better.
Some supplements contain much higher amounts, but a stronger product does not necessarily make it a better everyday choice.
People with a diagnosed vitamin D deficiency may be given different advice or higher-dose supplementation by a healthcare professional.
That is a different situation from routine autumn and winter supplementation.
If you are simply following normal UK seasonal guidance, 10 micrograms is the figure to keep in mind.
What Does Vitamin D Do?
Vitamin D plays several important roles in the body.
It contributes to the maintenance of normal:
- bones
- teeth
- muscle function
- immune system function
It also helps the body absorb calcium and phosphorus.
This is why vitamin D commonly appears in multivitamin formulas rather than only being sold on its own.
It is worth remembering that vitamin D is not an instant energy booster.
If you are feeling tired, there can be many possible causes.
Our guide on why you may always feel tired and which nutrient deficiencies could be involved explains some of the wider nutritional factors.
Which Foods Contain Vitamin D?
Vitamin D is found naturally in a relatively small number of foods.
Useful sources include:
- salmon
- sardines
- mackerel
- herring
- trout
- egg yolks
- red meat
- liver
- some fortified breakfast cereals
- some fortified plant-based products
Oily fish is one of the better natural dietary sources.
Fortified foods can also help, although the amount varies between products.
That is why it is worth checking the nutrition label.
Can You Get Enough Vitamin D From Food Alone?
Possibly, but it can be difficult.
Vitamin D is not present in large amounts across a wide range of everyday foods.
This is one of the reasons the seasonal recommendation exists.
Someone who regularly eats oily fish and fortified foods may get more vitamin D from their diet than someone who does not, but supplementation during autumn and winter is still recommended for the general population.
A useful way to think about it is:
Food provides the foundation. A supplement can help cover the seasonal gap.
Our guide to supplements vs a healthy diet explains why supplements should complement healthy eating rather than replace it.
Who May Need Vitamin D All Year?
Some people may not make enough vitamin D from sunlight even during the brighter months.
People who may need to consider supplementation throughout the year include those who:
- spend very little time outdoors
- are housebound
- live in a care home or similar setting
- usually cover most of their skin when outdoors
- have darker skin, including people from African, African-Caribbean and South Asian backgrounds
These groups have a higher risk of vitamin D deficiency.
If you fall into one of these groups, year-round supplementation may be worth discussing with a healthcare professional.
What About Children?
Vitamin D guidance is slightly different for young children.
Children aged 1 to 4 years should receive a daily supplement containing 10 micrograms of vitamin D throughout the year.
Babies may also need supplementation depending on whether they are breastfed and how much infant formula they consume.
Parents should always follow age-specific guidance and avoid giving adult supplements to young children unless the product is clearly suitable for their age.
Can You Take Too Much Vitamin D?
Yes.
Vitamin D is a fat-soluble vitamin, which means excessive amounts can build up in the body over time.
Taking too much vitamin D for a prolonged period can cause calcium levels in the blood to become too high.
That can affect the kidneys, bones and heart.
So avoid the idea that taking several times the recommended amount will give you several times the benefit.
It will not.
If you use more than one supplement, check whether each product contains vitamin D.
For example, you might be taking:
- a multivitamin
- a standalone vitamin D supplement
- another beauty or wellness formula containing vitamin D
That can lead to unnecessary duplication.
Our guide to how many vitamin gummies you should take a day explains why serving size and nutrient strength matter more than simply counting gummies.
Vitamin D2 vs Vitamin D3
You may see two main forms of vitamin D on supplement labels:
Vitamin D2, also known as ergocalciferol
and
Vitamin D3, also known as cholecalciferol
Both forms can contribute to vitamin D intake.
For most people choosing an everyday supplement, the most important things to check are:
- vitamin D amount per serving
- serving size
- dietary suitability
- other vitamins already included
- recommended daily use
Yumi All Day Energy currently uses vitamin D2, or ergocalciferol, and provides 10 micrograms per two-gummy serving.
For a more detailed comparison of formats and dosage, see our complete vitamin D gummies guide.
Are Vitamin D Gummies Effective?
Gummies are simply one way of delivering vitamin D.
Vitamin D supplements are also available as:
- tablets
- capsules
- sprays
- liquid drops
What matters most is the amount provided and whether you take the product consistently.
For people who dislike swallowing tablets, gummies can be a more convenient option.
That does not mean every gummy is automatically better than every tablet.
The formulation, dose and your ability to stick to the routine all matter.
When Is the Best Time to Take Vitamin D?
There is no single perfect time of day.
The best time is usually the time you can remember consistently.
Vitamin D is fat-soluble, so taking it with a meal containing some dietary fat is a practical approach.
For example:
- breakfast
- lunch
- your main evening meal
If vitamin D is part of a multivitamin containing vitamins A or E as well, taking it alongside food can also fit naturally with the rest of the formula.
You can read more about supplement timing in our guide to when to take vitamin gummies.
Can You Take Vitamin D With Other Vitamins?
Often, yes.
Vitamin D is frequently included in multivitamin products.
The key issue is overlap.
If your multivitamin already provides vitamin D and you also take a separate vitamin D product, you need to consider your total intake.
This is why it is better to look at your supplement routine as a whole instead of treating every bottle separately.
If you are unsure, compare the nutrition labels before combining products.
Should You Start Taking Vitamin D Exactly on 1 October?
No.
You do not need to treat 1 October as a medical deadline.
The October to early March period is used because this is generally when UK sunlight is not strong enough for adequate vitamin D production in the skin.
The practical idea is simply to use autumn as a reminder.
A simple seasonal routine could look like this:
October: start or review your vitamin D routine.
November to February: take it consistently.
Early March: continue through the end of the winter guidance period.
Late March or early April onwards: most people can begin producing vitamin D from stronger sunlight again.
Some people may still need year-round supplementation.
Does Spending More Time Outside in Winter Help?
Spending time outdoors is still good for your health.
Walking, exercise and daylight can all support overall wellbeing.
But going outside more often in December does not necessarily solve the vitamin D issue.
The problem is not simply that people spend less time outdoors.
The winter sunlight itself is weaker.
So even someone who regularly walks outdoors may still need to follow the general autumn and winter supplementation advice.
Does Vitamin D Prevent Colds?
Vitamin D contributes to normal immune system function.
That does not mean a vitamin D supplement will prevent every cold, flu or winter infection.
Supplements should not be viewed as a guarantee against illness.
Good winter health depends on the bigger picture, including:
- balanced nutrition
- adequate sleep
- regular activity
- hydration
- stress management
- appropriate medical advice
Vitamin D is one part of that wider routine.
Do You Need a Vitamin D Blood Test?
Most people do not need to self-diagnose vitamin D deficiency based on general symptoms.
Symptoms such as tiredness or muscle discomfort can have many possible causes.
If you are concerned about deficiency, have risk factors or have been advised to check your vitamin D levels, speak to your GP or another healthcare professional.
A diagnosed deficiency may require different treatment from ordinary seasonal supplementation.
A Simple Vitamin D Routine for Winter
A practical routine does not need to be complicated.
- Check what you already take. Your multivitamin may already contain vitamin D.
- Look for 10 micrograms. That equals 400 IU.
- Choose a format you can stick with. Gummies, tablets, sprays and drops can all work.
- Take it consistently. Attach it to an existing habit such as breakfast or lunch.
- Keep eating vitamin D-containing foods. Supplements do not replace a balanced diet.
- Review your routine in spring.
- Consider whether you need year-round supplementation if you are in a higher-risk group.
Frequently Asked Questions
Should I take vitamin D in winter in the UK?
UK guidance advises adults and children over 4 to consider taking 10 micrograms of vitamin D per day during autumn and winter.
How much vitamin D should adults take in winter?
For most adults, the standard recommendation is 10 micrograms, or 400 IU, per day.
When should I start taking vitamin D for winter?
The relevant period is generally October to early March.
Is 10 micrograms the same as 400 IU?
Yes. Ten micrograms of vitamin D equals 400 IU.
Can I get enough vitamin D from food?
Some foods provide vitamin D, particularly oily fish and fortified foods, but it can be difficult to get enough through diet alone during autumn and winter.
Do I need vitamin D if I go outside every day?
Possibly. During UK winter, the sunlight is generally not strong enough for the body to make sufficient vitamin D.
Who should consider vitamin D all year?
People who have little sun exposure, cover most of their skin outdoors or have darker skin may need to consider year-round supplementation.
Can I take vitamin D as part of a multivitamin?
Yes. For example, Yumi's All Day Energy Gummies currently provide 10 micrograms of vitamin D per recommended daily serving.
Is vitamin D better as gummies or tablets?
Neither format is automatically better. Look at the nutrient amount, formulation, dietary suitability and which format you are most likely to take consistently.
The Bottom Line
If you live in the UK, vitamin D deserves extra attention during autumn and winter.
From October to early March, sunlight is not generally strong enough for most people to make sufficient vitamin D through their skin.
For most adults, the recommendation is simple:
Consider taking 10 micrograms, or 400 IU, of vitamin D each day during autumn and winter.
Some people may need this throughout the year.
Before adding another supplement, check what you already take.
If you prefer vitamin D as part of a broader daily multivitamin routine, Yumi Nutrition All Day Energy Gummies currently provide 10 micrograms of vitamin D per recommended two-gummy serving.
You can also explore Yumi Nutrition to discover chewable supplements for everyday nutrition, sleep, gut health, hair and skin, and other daily wellbeing routines.
Food supplements should not be used as a substitute for a varied, balanced diet and healthy lifestyle. If you have a medical condition, take medication, are being treated for vitamin D deficiency or are unsure whether a supplement is suitable for you, speak to a qualified healthcare professional.