Vitamin D Deficiency
Assess whether you present clinical signs of vitamin D deficiency: little sun, bone pain, tender tendons, muscle pain, stooped back.
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Keeping your balance
Maintain regular sun exposure
Expose yourself to sunlight 15 to 20 minutes per day between 11am and 3pm, with arms and face uncovered, without sunscreen during this short period. Cutaneous vitamin D synthesis requires direct UVB rays, impossible through a window. In winter (October to April), supplementation becomes necessary at our latitudes.
Consume food sources regularly
Small oily fish (sardines, mackerel, anchovies, herring) naturally provide vitamin D3. Cod liver oil remains the most concentrated food source. Egg yolks from free-range chickens and UV-exposed mushrooms supplement your intake.
Have your 25-OH-D tested annually
Even without symptoms, annual testing of 25-OH vitamin D (at the end of winter, when levels are lowest) allows you to verify that your status remains in the optimal zone of 40 to 60 ng/mL. A satisfactory level guarantees strong immunity, good bone mineralization and mood balance.
What you can do
Supplement daily with D3
A daily supplementation of vitamin D3 (cholecalciferol) is recommended, preferably in oily form taken with the fattest meal of the day. Prefer daily dosing over high-dose monthly vials, as it better mimics physiological cutaneous synthesis. Doses are set with your doctor or your naturopath, all the more so if you already take a medication.
Always combine with vitamin K2
Vitamin K2 (MK-7) is the essential partner of vitamin D3. It activates osteocalcin (calcium fixation on bone) and MGP (Matrix Gla Protein, which prevents calcium from depositing in arteries). Without K2, D3 supplementation can promote arterial calcifications. Doses are set with your doctor or your naturopath, all the more so if you already take a medication.
Optimize your sun exposure
If your lifestyle confines you indoors, reorganize your breaks to get 15 to 20 minutes of sun exposure per day at peak hours. Melanin, age, obesity and sunscreens significantly reduce cutaneous synthesis. Dark-skinned individuals need 3 to 5 times more exposure time.
Strengthen food intake
Consume wild oily fish (sardines, mackerel, herring, salmon) two to three times per week. Cod liver oil (one teaspoon per day) is the richest natural source, providing both vitamins A and D. Sun-dried shiitake mushrooms contain vitamin D2.
Have your 25-OH vitamin D tested
Request a blood test for 25-OH vitamin D to objectify the deficit. The optimal zone is between 40 and 60 ng/mL (100-150 nmol/L). A level below 20 ng/mL indicates frank deficiency requiring active correction. Also test PTH and blood calcium to assess bone impact.
What you can do
What you can add
In a deficiency confirmed by a blood test, a loading dose of D3 is often necessary for 8 to 12 weeks, then a maintenance dose. The oily form in drops allows precise dosing and daily intake, preferable to monthly vials. Doses are set with your doctor or your naturopath, all the more so if you already take a medication.
Never supplement without K2 and magnesium
Vitamin K2 (MK-7) is essential to direct calcium to bones (osteocalcin) and away from arteries (MGP). Magnesium is the cofactor for vitamin D hydroxylation enzymes (hepatic CYP2R1, renal CYP27B1): without sufficient magnesium, vitamin D remains inactive. Systematically combine D3 + K2 + magnesium. Doses are set with your doctor or your naturopath, all the more so if you already take a medication.
Reorganize your sun exposure
Sun exposure remains the physiological route of vitamin D production. Progressively expose yourself to sunlight 20 to 30 minutes daily, without sunscreen, exposing maximum body surface. In winter at our latitudes, UVB is insufficient: only supplementation can maintain levels.
Massively enrich your diet
Integrate daily the best food sources: cod liver oil (250 mcg/100g), smoked herring, sardines, mackerel, anchovies, tinned cod liver. Egg yolks from free-range chickens and sun-dried mushrooms (shiitake, maitake) supplement intake. Vegan sources of D3 come from lichens.
Explore underlying causes
Persistent deficiency despite supplementation may reveal intestinal malabsorption (celiac disease, Crohn’s, bile insufficiency), obesity (sequestration in fatty tissue), liver or kidney insufficiency (hydroxylation defect), or interfering medications (anticonvulsants, corticosteroids). Identify and treat the cause.
Establish biological monitoring
Test 25-OH vitamin D every 3 months until reaching the optimal zone (40-60 ng/mL), then monitor twice yearly (late winter and late summer). Combine testing with PTH, blood calcium, phosphemia and 24-hour urinary calcium to monitor phosphocalcium metabolism and adjust doses.
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Related tests
This result is an educational naturopathic self-assessment. It is neither a diagnosis nor medical advice, and it does not replace a consultation. Only a health professional can confirm or rule out a disorder. If symptoms persist, or if you are pregnant, breastfeeding or on any treatment, talk to your doctor before taking any supplement or herbal preparation, and never stop a treatment without medical advice.
How to read this test
Assess whether you present clinical signs of vitamin D deficiency: little sun, bone pain, tender tendons, muscle pain, stooped back. Free, 7 questions.
Vitamin D is actually a steroid hormone synthesized by the skin under the effect of UVB rays. It is essential for calcium absorption, bone strength and proper immune system function. In France, insufficient sunlight from October to April makes deficiency extremely common: it is estimated that 80% of the French population has a vitamin D deficit, with consequences for immunity, mood and bone health.
Strengths
- Rapid identification of clinical signs
- Simple self-assessment test
- Deficiency very common in France, screening particularly relevant
Limitations
- Does not replace blood testing
- Some signs may have other causes
- Limited sensitivity for subclinical deficiencies