Vitamin D Deficiency Symptoms UK - Are You Deficient?
Vitamin D deficiency symptoms UK - are you deficient?
An estimated one in five adults in the UK is Vitamin D deficient, and up to one in three is insufficient. The symptoms of Vitamin D deficiency are vague, overlap with many other conditions and are easy to dismiss as normal tiredness or the effects of a busy life. But for women in perimenopause and menopause, unaddressed Vitamin D deficiency can compound the challenges of hormonal change significantly. Here is what to look for.
Why Vitamin D deficiency is so common in the UK
The UK's latitude means the sun is not strong enough to produce Vitamin D in the skin from approximately October to March — roughly half the year. Even during summer months, adequate sun exposure is limited by cloud cover, indoor working and the use of sunscreen. Vitamin D is present in very few foods in meaningful quantities — mainly oily fish, egg yolks and fortified foods. The gap between what most UK adults can realistically obtain through diet and sunlight and what the body needs is significant.
The most common Vitamin D deficiency symptoms
Persistent fatigue and low energy
Vitamin D receptors are present in virtually every tissue in the body. Deficiency impairs mitochondrial function and ATP production — the cellular energy processes that power everything from muscle contraction to cognitive function. Chronic fatigue that does not resolve with adequate sleep is one of the most consistent reported symptoms of Vitamin D deficiency.
Bone pain and muscle weakness
Vitamin D is essential for calcium absorption and bone mineralisation. Severe deficiency causes rickets in children and osteomalacia (softening of bones) in adults, characterised by bone pain and aching muscles. Milder deficiency causes subtle bone discomfort and muscle weakness that many people attribute to ageing rather than nutritional status.
Low mood and depression
Vitamin D receptors are present throughout the brain and Vitamin D plays a role in serotonin synthesis — the neurotransmitter most associated with mood regulation. Multiple studies have found associations between Vitamin D deficiency and increased risk of depression. Seasonal Affective Disorder (SAD) — low mood during winter months — is thought to be at least partly driven by declining Vitamin D levels.
Frequent illness and slow recovery
Vitamin D is one of the most important regulators of immune function — particularly the innate immune system's first response to infection. People with Vitamin D deficiency are significantly more susceptible to respiratory infections and take longer to recover. If you seem to catch every cold going and take unusually long to recover, Vitamin D deficiency is worth investigating.
Hair loss
Vitamin D plays a role in the creation of new hair follicles. Deficiency is associated with alopecia areata and general hair thinning. This is particularly relevant for women experiencing hair changes during perimenopause and menopause, where Vitamin D deficiency can compound the hair thinning driven by collagen and oestrogen decline.
Slow wound healing
Vitamin D stimulates the production of compounds needed for wound healing, including growth factors that promote new skin formation. Slow healing of cuts and minor injuries can be a sign of deficiency, particularly relevant for women with diabetes or other conditions affecting wound healing.
Who is most at risk of Vitamin D deficiency in the UK?
- Women during perimenopause and menopause — increased bone health requirements and often reduced outdoor activity
- Anyone with darker skin — melanin reduces the skin's ability to produce Vitamin D from sunlight
- Anyone who spends most of the day indoors
- People over 65 — skin becomes less efficient at producing Vitamin D with age
- Pregnant women and breastfeeding mothers
- Anyone living in northern England, Scotland or Northern Ireland — the least sunlight in the UK
What to do if you think you are deficient
Ask your GP for a 25-hydroxyvitamin D blood test — this is the standard test for Vitamin D status. A result below 50 nmol/L indicates deficiency. Between 50 and 75 nmol/L is considered insufficient. Above 75 nmol/L is optimal.
Kollo Vitamin D3 delivers 4,000 IU of Vitamin D3 per daily serving in a convenient liquid spray — simply spray directly under the tongue for fast, efficient absorption. No tablets, no capsules. For women managing menopause and bone health, this clinically relevant dose supports the calcium absorption and bone density maintenance that oestrogen decline compromises. For the full picture of Vitamin D and menopause read our guide to Vitamin D and menopause and our complete guide to the best supplements for women over 40.
Kollo Health was co-founded by Jenni Falconer - TV presenter, Smooth Radio breakfast host, ten-time London Marathon runner and host of the RunPod podcast. Read her story and why she created Kollo.
