Get tested with Superpower

If you’ve been postponing blood testing for years or feel frustrated by doctor appointments and limited lab panels, you are not alone. Standard healthcare is often reactive, focusing on testing only after symptoms appear or leaving patients in the dark.

Superpower flips that approach. We give you full insight into your body with over 100 biomarkers, personalized action plans, long-term tracking, and answers to your questions, so you can stay ahead of any health issues.

With physician-reviewed results, CLIA-certified labs, and the option for at-home blood draws, Superpower is designed for people who want clarity, convenience, and real accountability - all in one place.

Key benefits of Vitamin A testing

• Confirms whether your vitamin A level supports vision, immunity, and skin health.
• Spots deficiency that may explain night blindness or frequent infections early.
• Flags excess intake from supplements that can harm your liver or bones.
• Guides safe supplementation during pregnancy to protect fetal development without toxicity.
• Tracks response to treatment if you have malabsorption or liver disease.
• Clarifies unexplained skin changes, dry eyes, or poor wound healing.
• Best interpreted with retinol-binding protein and liver function if absorption is impaired.

What is Vitamin A?

Vitamin A is a fat-soluble nutrient obtained from food and stored primarily in the liver. It exists in two main dietary forms: preformed vitamin A (retinol) from animal sources like liver, eggs, and dairy, and provitamin A carotenoids (such as beta-carotene) from colorful fruits and vegetables that the body converts into active retinol.

Your body's master regulator of vision and growth

Vitamin A plays essential roles in vision, immune defense, and cellular communication. In the eye, it forms part of rhodopsin, the light-sensitive pigment that enables you to see in dim conditions. Beyond vision, it regulates gene expression, guiding how cells grow, differentiate, and maintain the integrity of skin and mucous membranes.

Why measuring it matters

Blood levels of vitamin A reflect both recent dietary intake and liver reserves. Because the liver tightly controls release into circulation, serum levels remain stable until stores become severely depleted or excessive. Measuring vitamin A helps identify deficiency states that impair immunity and vision, or toxicity from oversupplementation.

Why is Vitamin A important?

Vitamin A governs vision, immune defense, skin integrity, and cellular growth across nearly every organ system. It exists in your blood primarily as retinol, and healthy levels typically range from the mid-to-upper portion of the reference interval, reflecting adequate liver stores and dietary intake.

Your eyes depend on it to see in the dark

When vitamin A drops too low, night blindness often appears first, signaling that the retina cannot regenerate the light-sensing pigment rhodopsin. The immune system weakens, leaving you vulnerable to infections, especially respiratory and gastrointestinal.

Skin becomes dry and rough, wounds heal slowly, and children experience stunted growth. Women may face irregular menstrual cycles, and pregnant women risk fetal developmental abnormalities if deficiency is severe.

Too much can harm your liver and bones

Excessive vitamin A, whether from oversupplementation or high-dose retinoid medications, accumulates in the liver and can cause toxicity. Symptoms include headache, nausea, dizziness, and blurred vision.

Chronic excess weakens bones, raising fracture risk, and during pregnancy can lead to serious birth defects. Men and postmenopausal women are particularly susceptible to bone effects.

It bridges nutrition, immunity, and long-term resilience

Vitamin A sits at the intersection of sensory function, epithelial barrier health, and immune surveillance. Imbalances ripple outward, affecting infection resistance, cancer risk, and metabolic signaling. Maintaining optimal levels supports lifelong tissue repair, vision, and defense against disease.

What do my Vitamin A results mean?

Low vitamin A usually reflects inadequate intake or absorption problems

Low values usually reflect insufficient dietary intake, fat malabsorption, or chronic liver disease. Vitamin A is a fat-soluble vitamin stored primarily in the liver, so conditions that impair fat digestion or liver function can deplete reserves. Early signs include night blindness and dry eyes, as vitamin A is essential for retinal pigment formation and mucous membrane health. Prolonged deficiency affects immune function, skin integrity, and growth in children. Pregnant women with low levels face higher risk of maternal night blindness and may impact fetal development.

Optimal vitamin A supports vision, immunity, and tissue health

Being in range suggests adequate stores to support vision, immune surveillance, and epithelial cell turnover throughout the body. Vitamin A plays a central role in gene expression, cell differentiation, and maintaining healthy mucous membranes in the respiratory and digestive tracts. Most healthy adults maintain stable levels with balanced intake of preformed vitamin A from animal sources or provitamin A carotenoids from plants.

High vitamin A usually reflects excessive supplementation

High values usually reflect chronic high-dose supplementation, as dietary intake alone rarely causes toxicity. Excess vitamin A accumulates in the liver and can lead to headaches, dizziness, nausea, and in severe cases, liver damage or bone thinning. Pregnant women should avoid high doses due to teratogenic risk.

Interpretation depends on supplement use and liver health

Results are influenced by recent supplement intake, liver function, and acute illness, which can transiently lower circulating levels. Retinol binding protein status also affects measurement accuracy.