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Conditions
VitaminDDeficiency
Insufficient vitamin D levels causing fatigue, bone pain, muscle weakness, and mood changes. Surprisingly common in Australia despite abundant sunshine.
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From $49.95 · No appointment needed
6 min
avg cert turnaround
13 min
avg doctor review
2
days a week
30%
refund if declined
Symptoms
CommonsymptomsofVitaminDDeficiency
An AHPRA-registered doctor assesses these symptoms online - no in-person visit required.
Persistent fatigue and tiredness
Bone pain, especially in back, hips, or legs
Muscle weakness or cramps
Low mood or depression
Frequent infections
Slow wound healing
Hair loss
Our Scope
Howwecanhelp
InstantMed handles many common conditions entirely online. Here's what fits our service.
What we can help with
- Blood test referrals for vitamin D levels
- Supplementation advice (dose, duration)
- Assessment of risk factors
- Medical certificates if symptoms are debilitating
What needs in-person care
- Assessment for osteoporosis (needs DEXA scan)
- Investigation of severe calcium/bone disorders
- In-person musculoskeletal examination
Depending on your situation, an AHPRA-registered doctor may be able to issue a medical certificate or arrange a repeat prescription after reviewing your request online.
Clinical Guidance
Whentoseeadoctor
These indicators suggest you should seek professional medical advice promptly.
Signs you need a doctor
- 1Persistent fatigue with bone or muscle pain
- 2You are in a high-risk group (dark skin, covered clothing, limited sun exposure, elderly)
- 3Blood tests showing low vitamin D
- 4Recurrent infections or slow healing
- 5You need supplementation advice
Seek emergency care if
- Severe bone pain with inability to weight-bear
- Muscle weakness with difficulty walking
Call 000 or go to your nearest emergency department
Clinical Insight
Adoctor'sperspectiveonVitaminDDeficiency
InstantMed Clinical Team
AHPRA-registered medical team · Reviewed 2026-03
Vitamin D deficiency is one of the great paradoxes of Australian health - we live in one of the sunniest countries on earth, yet 1 in 4 adults are deficient. The explanation is our (very successful) sun protection messaging combined with modern indoor lifestyles. Many of my patients spend their daylight hours in offices and apply sunscreen religiously before any outdoor activity. Vitamin D is crucial for bone health, immune function, and mood regulation. Deficiency contributes to osteoporosis, muscle weakness, fatigue, and depression. The diagnosis is a simple blood test (25-hydroxyvitamin D). Treatment is straightforward: supplementation at the appropriate dose for the level of deficiency. I routinely check vitamin D in patients presenting with fatigue, bone pain, recurrent infections, or depression - it is a treatable cause that is frequently overlooked.
Treatment
TreatingVitaminDDeficiency
Vitamin D supplementation is the primary treatment for deficiency. Colecalciferol (vitamin D3) is preferred over ergocalciferol (vitamin D2) due to superior potency and shelf-life. Dosing depends on the degree of deficiency: mild deficiency (25-49 nmol/L) typically requires 1000-2000 IU daily; moderate deficiency (12.5-24 nmol/L) requires higher loading doses (2000-4000 IU daily or weekly loading). High-dose loading regimens (50,000 IU weekly) are used under medical supervision for severe deficiency and require prescription. The target level per Australian guidelines is 50-150 nmol/L; levels over 250 nmol/L indicate toxicity risk.
Colecalciferol (vitamin D3)
Ostelin, D-Pearls, Nature's Way Vitamin D3
Class:Fat-soluble vitamin / pro-hormone
Typical dose:Mild deficiency: 1000-2000 IU daily. Moderate deficiency: 2000-4000 IU daily. Take with a meal containing fat for optimal absorption
PBS:Available OTC without prescription in doses up to 10,000 IU per tablet; widely available at pharmacies and supermarkets
- Preferred form of vitamin D supplementation -- D3 is more potent and longer-acting than D2 (ergocalciferol)
- Fat-soluble: take with a meal containing fat (whole milk, cheese, avocado) to maximise absorption
- Recheck blood levels after 3 months to confirm adequate response and adjust dose
- Ongoing maintenance dose (600-1000 IU daily) usually needed to prevent re-depletion
Colecalciferol (high-dose prescription)
D3 Forte, Cholecalciferol SAS
Class:Fat-soluble vitamin / pro-hormone (high dose)
Typical dose:50,000 IU once weekly for 6-8 weeks for severe deficiency, then maintenance; OR a single intramuscular dose (300,000 IU) in some protocols
PBS:High-dose D3 (25,000-50,000 IU) requires prescription; PBS listed for specific indications including severe deficiency and malabsorption
- Used for severe deficiency (below 12.5 nmol/L) or when malabsorption is present
- Weekly high-dose loading is better tolerated than daily high-dose dosing
- Medical supervision required -- monitor for hypercalcaemia with very high doses
- A telehealth consult can assess level of deficiency and prescribe high-dose if indicated
Source: Endocrine Society of Australia: Vitamin D and Health position statement, 2023; Therapeutic Guidelines -- Endocrinology, 2024; Australian Cancer Council: Position statement on vitamin D and sun exposure. This information is educational only and does not replace clinical assessment.
Specialist referral: Refer to an endocrinologist if: severe or recurrent vitamin D deficiency despite adequate supplementation (investigate malabsorption, hypoparathyroidism, or renal disease), suspected osteomalacia (bone pain with low vitamin D), or vitamin D levels above 250 nmol/L (toxicity). Bone density (DEXA) assessment should be considered in patients with prolonged severe deficiency, especially postmenopausal women and men over 70.
Vitamin D Deficiency in Australia
1 in 4 Australian adults (23%) are vitamin D deficient (below 50 nmol/L)
Deficiency is highest in winter months and in southern states (VIC, TAS, SA)
People with darker skin require 3-6 times more sun exposure to produce the same amount of vitamin D
Vitamin D deficiency is associated with increased risk of osteoporosis, falls, depression, and some cancers
Recovery
Whattoexpect
Typical recovery timeline and return-to-work guidance for most patients.
Typical recovery
With appropriate supplementation, most people notice improvement in energy and mood within 4-6 weeks. Blood levels typically normalise within 2-3 months. Bone pain may take longer to fully resolve.
Return to work
Vitamin D deficiency rarely prevents work directly. Severe deficiency with significant fatigue, bone pain, or muscle weakness may warrant reduced duties. Supplementation resolves symptoms gradually.
When to reassess
Recheck vitamin D levels after 3 months of supplementation. See a doctor if symptoms persist despite normal levels (another cause may be contributing), or if you have bone pain with vitamin D deficiency (may need calcium and bone density assessment).
Self-Care
ManagingVitaminDDeficiencyathome
Evidence-based tips to support your recovery alongside medical treatment.
Take vitamin D3 supplements with a meal containing fat - vitamin D is fat-soluble and absorbs better with food
In winter (May-August, south of Sydney): supplement 1,000-2,000 IU daily as sun exposure is usually insufficient
In summer: aim for 5-10 minutes of midday sun on arms and face, 4-5 days per week. Don't burn
If you have dark skin, wear covering clothing, or work indoors during daylight: supplement year-round
Don't mega-dose without medical advice - vitamin D toxicity is rare but possible with very high doses over time
Combine with calcium-rich foods (dairy, fortified plant milk, leafy greens) for bone health
FAQ
CommonquestionsaboutVitaminDDeficiency
Answers to the most common questions from patients.
Despite our sunshine, 1 in 4 Australians are vitamin D deficient. Risk factors include dark skin, office work (limited midday sun), sun avoidance, covered clothing, southern latitudes in winter, and being elderly or housebound.
For mild deficiency: 1,000 IU daily. Moderate deficiency: 2,000-4,000 IU daily. Severe deficiency: your doctor may prescribe a high-dose loading course. Always retest after 3 months to check levels.
It's very difficult. Few foods contain significant vitamin D - oily fish, egg yolks, and fortified milk are the main sources. Most people need supplements and/or safe sun exposure.
In summer: 5-10 minutes of midday sun on arms and face, 4-5 days a week. In winter (especially south of Sydney): longer exposure needed, or supplementation is recommended. Never sunburn - the cancer risk outweighs the vitamin D benefit.
Ready to get help with Vitamin D Deficiency?
Australian-registered doctors review your request when available.
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