Vitamin D Deficiency: Symptoms, Causes & Treatment in the Dominican Republic

Many people experience unexplained symptoms – fatigue, joint pain, hair loss, even mood changes – that can lead to a frustrating search for answers. Often overlooked as symptoms of other conditions, these issues can actually point to a surprisingly common deficiency: vitamin D.

While often called a vitamin, vitamin D functions more like a hormone in the body, playing a crucial role in calcium absorption, bone health, immune function, and even potentially reducing the risk of chronic diseases. Despite its importance, and the body’s ability to produce vitamin D through sun exposure, deficiency is widespread, even in sun-rich countries like the Dominican Republic.

“Se me caía el pelo, más bien el pelo no me crece, manchas en la cara, dolor en las articulaciones, cansancio permanente y mucho sueño,” described one individual, Consuelito, whose symptoms were ultimately linked to low vitamin D levels. She had previously received incorrect diagnoses of lupus and arthritis before discovering the potential connection to vitamin D deficiency.

Consuelito’s experience isn’t isolated. Laboratory tests since 2021 have revealed her vitamin D levels consistently fall between 7.8 and 19.8 nanograms per milliliter (ng/ml), categorized as insufficient. Medical guidelines generally consider levels between 30 to 100 ng/ml as sufficient.

According to endocrinologist, nutritionist, and obesity specialist Hilda Escaño Mieses, several factors contribute to this widespread deficiency. Modern lifestyles often involve prolonged periods indoors, limiting sun exposure. The use of umbrellas and tinted car windows further reduces the skin’s ability to synthesize vitamin D from ultraviolet (UV) rays.

“Vitamin D is not just a vitamin, it’s a pro-hormone,” explains Dr. Escaño Mieses. “It behaves as such because it helps to produce other hormones and also helps the body absorb calcium and maintain strong bones.”

Beyond Bone Health: Wider Implications of Vitamin D Deficiency

The impact of adequate vitamin D levels extends beyond skeletal health. Sufficient vitamin D improves insulin function and supports the immune system. It can also enhance muscle strength, potentially reducing the risk of falls in older adults, and may help regulate inflammation and decrease the risk of autoimmune diseases.

Maintaining vitamin D levels between 30 and 50 ng/ml is generally recommended. While sunlight is the primary source, vitamin D is also found in smaller amounts in fatty fish, eggs, and fortified foods. However, supplementation is often necessary to achieve and maintain optimal levels.

Risk Factors and Underlying Conditions

Certain factors can increase the risk of vitamin D deficiency. Obesity, for example, can “sequester” vitamin D in adipose tissue, lowering circulating levels. Aging also plays a role, as the skin’s ability to produce vitamin D declines with age. Individuals with liver disease may also experience impaired vitamin D metabolism.

Symptoms of deficiency can be subtle, including frequent illness, muscle weakness, aching bones, fatigue, and even hair loss. However, many people may experience no noticeable symptoms despite having insufficient levels, highlighting the importance of proactive screening.

Access to Testing and Treatment

Unfortunately, vitamin D testing isn’t routinely included in standard health checkups. Patients often need to specifically request the test from their healthcare provider. Currently, the basic health plan does not cover the cost of the test, which exceeds RD$1,600.

Dr. Escaño Mieses notes that awareness among physicians is growing, with increasing numbers of gynecologists, cardiologists, nutritionists, and endocrinologists now recommending vitamin D testing.

Maximizing Vitamin D Production and Supplementation

Vitamin D is produced through direct exposure to ultraviolet radiation, particularly between 10:00 AM and 3:00 PM. It’s recommended to expose arms and legs to sunlight for 10 to 20 minutes three to four times per week, without sunscreen initially. Sunscreen can then be applied for further protection.

Dietary sources of vitamin D include salmon, sardines, tuna, egg yolks, and fortified dairy products, though these provide relatively small amounts. When deficiency is identified, supplementation with vitamin D3 (cholecalciferol) is often recommended to restore adequate levels.

“So, if we want to have strong bones, if we want to have greater muscle strength, if we want to have better insulin sensitivity, for those patients who have insulin resistance, it is extremely necessary that we have adequate levels of vitamin D,” Dr. Escaño Mieses concludes.

For maintenance, a daily dose of 800 to 2,000 units may be sufficient. Individuals with insufficiency (20 to 29 ng/ml) may require 2,000 to 4,000 units per day, while those with more significant deficiencies may need 50,000 units every 6 to 8 weeks. Dosage should be individualized, particularly in individuals with obesity, malabsorption issues, or those who have undergone bariatric surgery.