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Also reported in: nmol/L
Vitamin D in the 30–49 ng/mL range is sufficient to prevent deficiency-related diseases. Calcium absorption, bone mineralization, and basic immune function are supported.
At this very deficient level, your body is very lacking vitamin D — a hormone that regulates calcium absorption, bone density, immune function, mood, inflammation, and potentially cancer cell behavior. Without it, bones soften, the immune system weakens, and depression risk climbs noticeably.
See your doctor urgently for a high-dose vitamin D loading protocol (typically 50,000 IU weekly for 8–12 weeks). Retest after supplementation.
Vitamin D (25-OH): {{value}} {{unit}} — very low (ref: {{low}}–{{high}})Vitamin D deficiency (below 20 ng/mL) is one of the most prevalent nutritional deficiencies worldwide. At this level, calcium absorption decreases (weakening bones), immune surveillance falters, mood regulation suffers, and fatigue becomes a chronic companion. Most adults who live indoors or in cloudy climates are deficient.
Start vitamin D3 supplementation (2,000–4,000 IU daily with vitamin K2). Get 15–20 minutes of midday sun when possible. Retest in 3 months. Fish, egg yolks, and fortified foods also help.
Vitamin D (25-OH): {{value}} {{unit}} — deficient (<20 ng/mL) (ref: {{low}}–{{high}})Vitamin D in the 20–29 ng/mL range is considered insufficient — above deficiency but below the level needed for optimal bone protection, immune function, and mood regulation. You may experience subtle fatigue and reduced immune resilience.
Supplement with 2,000 IU of vitamin D3 daily. Retest in 3–4 months. Pair with vitamin K2 (100–200 mcg) for better calcium distribution.
Vitamin D (25-OH): {{value}} {{unit}} — insufficient (20–29 ng/mL)Vitamin D in the 30–49 ng/mL range is sufficient to prevent deficiency-related diseases. Calcium absorption, bone mineralization, and basic immune function are supported.
No deficiency to treat. To move toward the optimal range (50–80 ng/mL), consider 1,000–2,000 IU daily supplementation, especially in winter months.
Vitamin D (25-OH): {{value}} {{unit}} — normal range (30–49 ng/mL)Vitamin D in the 50–80 ng/mL range is associated with the most robust bone protection, immune function, mood stability, and potential cancer risk reduction. Most vitamin D researchers consider this the target range.
Excellent result. Maintain with 1,000–2,000 IU daily (or regular sun exposure) and retest once a year.
Vitamin D (25-OH): {{value}} {{unit}} — optimal (50–80 ng/mL)Vitamin D above 80 ng/mL is above optimal and while not yet toxic, continued supplementation at current doses may push levels into the potentially harmful range. Sun exposure alone rarely may contribute to toxicity — this is almost always supplementation-related.
Consider reducing vitamin D3 supplements to maintenance levels (1,000 IU or less daily). Retest in 6 months.
Vitamin D (25-OH): {{value}} {{unit}} — high-normal (80–100 ng/mL)Vitamin D levels above 100 ng/mL can lead to hypercalcemia — too much calcium in the blood — causing nausea, weakness, kidney stones, and in noticeable cases, kidney damage and cardiac arrhythmias.
Stop vitamin D supplementation immediately. See your doctor for calcium level testing. Levels above 100 ng/mL are considered potentially toxic, especially if calcium is also elevated.
Vitamin D (25-OH): {{value}} {{unit}} — excess (100–150 ng/mL)Vitamin D toxicity (hypervitaminosis D) at this level may contribute to hypercalcemia with serious complications: noticeable nausea, confusion, kidney failure, and cardiac arrhythmias. This is almost exclusively caused by excessive supplementation.
Stop all vitamin D supplements immediately and seek medical care. Calcium levels need urgent checking and management. IV hydration may be needed.
Vitamin D (25-OH): {{value}} {{unit}} — very high (>150 ng/mL)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.