One Injection.Months of Vitamin D.
A single high-dose intramuscular injection delivering 300,000 units of Vitamin D — rapidly restoring levels in people who are deficient, without the uncertainty of daily oral supplementation.
Book Your Vitamin D Injection01
Panel
What's Covered
A single I.M. injection of 300,000 units of cholecalciferol (D3) delivered into muscle tissue, from which it is gradually released into systemic circulation over weeks. This depot effect provides sustained Vitamin D repletion without the need for daily oral supplementation — and with certainty that the dose has been administered and absorbed. Vitamin D functions less like a vitamin and more like a hormone: it binds receptors in virtually every cell type and is involved in regulating the expression of a large number of genes.
01Immune function
Vitamin D is essential for innate and adaptive immune responses. It activates macrophages and natural killer cells, modulates the inflammatory response, and is directly antimicrobial — stimulating the production of cathelicidin and defensins. Deficiency is associated with increased susceptibility to respiratory infections and dysregulated immune responses.
02Bone and musculoskeletal health
Regulates calcium and phosphate absorption in the gut. Without adequate Vitamin D, calcium cannot be properly absorbed regardless of dietary intake. Important for bone mineralisation, bone health and muscle function; deficiency is associated with muscle weakness and falls risk.
03Mood and mental health
Vitamin D receptors are found throughout the brain. Low Vitamin D is consistently associated with depression, seasonal affective disorder, and cognitive decline, likely involving Vitamin D's role in serotonin synthesis and its neuroprotective properties.
04Cardiovascular and metabolic health
Vitamin D deficiency is associated with increased risk of cardiovascular disease, hypertension, insulin resistance, and type 2 diabetes across large population studies.
05Longevity signal
A 2014 meta-analysis of prospective studies found Vitamin D deficiency associated with significantly increased all-cause mortality. More recent research has examined Vitamin D's role in reducing inflammatory ageing through modulation of immune cell function and inflammatory cytokine production.
Public Health England estimates approximately 1 in 5 adults in the UK has low Vitamin D levels. In winter and early spring that proportion is substantially higher. Darker skin tones require significantly more sun exposure to synthesise equivalent amounts and are at higher risk of deficiency at UK latitudes.
02
Audience
Who It's For
Approximately 1 in 5 UK adults has low Vitamin D, substantially higher in winter and spring.
- Confirmed Vitamin D deficiency on blood testing
- In the UK during autumn and winter, wanting reliable repletion without months of daily supplementation
- Darker skin tone at higher risk of Vitamin D deficiency at UK latitudes
- Largely indoors, working night shifts, or with limited sun exposure
- Gut conditions affecting fat-soluble vitamin absorption
- History of osteoporosis, frequent infections, low mood, or chronic fatigue where Vitamin D may be a contributing factor
- EGA blood results have returned low or insufficient Vitamin D levels
03
Deliverable
Results and What to Expect
Effects build gradually as Vitamin D is released from muscle tissue over weeks.
- Serum 25(OH)D levels rise within days and typically peak within 2 to 4 weeks
- Symptom improvement typically over weeks as serum levels rise
- A follow-up blood test 6 to 8 weeks after injection confirms repletion
- Single loading dose is often sufficient, followed by ongoing oral maintenance supplementation
- Further injections or a second loading dose may be required if deficiency is severe or absorption is impaired
Important information: IV and injected nutrient treatments are not a substitute for a balanced diet or for medical treatment. Responses vary between individuals, and evidence of benefit in people without a diagnosed deficiency is still developing. Every treatment follows a clinical assessment, and your clinician will advise whether it is appropriate for you.
04
Difference
Why a Single Loading Dose Works
Oral supplementation is the standard recommendation, but compliance is variable, absorption depends on fat co-ingestion and gut health, and many people remain deficient despite supplementing.
Certainty of delivery
I.M. injection eliminates the absorption variability of oral supplementation. The dose is administered and absorbed from the muscle depot gradually, providing sustained circulating levels.
Standard clinical protocol
300,000 IU intramuscular loading is a recognised protocol used in NHS and private practice for Vitamin D deficiency repletion.
Safety in context
Vitamin D toxicity requires sustained elevation of serum 25(OH)D to very high levels — not a single depot injection. Not appropriate for people with normal or already-elevated levels, which is why clinical assessment is conducted before administration.
Clinical assessment first
EGA conducts a clinical assessment before administering the loading dose, including review of any recent Vitamin D testing and screening for contraindications.
05
Questions
Common Questions
How will I know if I need this injection?
The most reliable way is a blood test measuring your 25-hydroxyvitamin D level. EGA can arrange this if you do not have a recent result. Deficiency is defined as below 50 nmol/L; insufficiency as 50–75 nmol/L; sufficiency as above 75 nmol/L. The injection is most appropriate for people below 50 nmol/L.
How quickly will my levels improve?
Serum 25(OH)D levels rise within days of the injection and typically reach their peak within 2 to 4 weeks. A follow-up blood test 6 to 8 weeks after the injection confirms repletion.
Will I need more than one injection?
For many people, a single loading injection followed by ongoing oral maintenance supplementation (1,000–4,000 IU daily) is sufficient to maintain adequate levels. If your deficiency is severe or you have an underlying cause of poor absorption, a second loading injection may be required. Your clinician will advise.
Is the injection painful?
The injection is brief. Many clients describe mild transient discomfort at the injection site. Some people experience temporary soreness in the muscle over the following 24 to 48 hours.
Are there any contraindications?
Yes. High-dose Vitamin D injection is contraindicated in hypercalcaemia, sarcoidosis, other granulomatous conditions, and certain kidney disorders. Your clinician will screen for these at your assessment before proceeding.
Can I combine this with an IV drip on the same visit?
Yes. A Vitamin D injection is often combined with an IV drip session as an add-on.
06 · Next Step
Ready to book?
One Injection.
- 01Book online or by phoneBring recent Vitamin D test results or arrange testing through EGA.
- 02Attend your appointmentYour clinician reviews your Vitamin D level and confirms suitability. The injection takes under 5 minutes.
- 03Follow-up blood testApproximately 6 to 8 weeks later to confirm repletion.
- 04Plan next stepsReview response and decide on maintenance dosing with your clinician.