Category: Vitamins & Minerals

Numbness, burning, or tingling in someone with diabetes deserves an explanation. Diabetic peripheral neuropathy is one possibility, but vitamin B12 deficiency, thyroid disease, kidney disease, nerve compression, and other problems can produce similar symptoms. More […]

After bariatric surgery, iron monitoring should connect the procedure, symptoms, supplement plan, and possible blood loss. Iron deficiency can develop after weight-loss surgery even when the operation achieved its intended benefits. Changes in intake and […]

When treatment does not seem to help, the next step is to review the response, the treatment plan, and the reason iron was lost. You have been taking iron, but you still feel tired—or your […]

Selected 25-hydroxyvitamin D, calcium, albumin, phosphorus, and parathyroid hormone (PTH) tests can help clarify the pattern. Ulta Lab Tests provides the linked laboratory options for a plan developed with your healthcare professional. This information is […]

Exocrine pancreatic insufficiency, or EPI, occurs when too little pancreatic digestive-enzyme activity reaches the intestine to digest food adequately. It can cause greasy stools, unintended weight loss, and nutritional problems. The stool pancreatic elastase-1 test […]

Celiac disease testing is most informative before you stop eating gluten. Celiac disease is an immune-mediated condition in which gluten damages the small intestine in susceptible people. That injury can cause digestive symptoms, but it […]

Vitamin B12 deficiency develops when the body does not have enough usable B12 to support normal nerve function and blood-cell production. Autoimmune gastritis is one possible cause: immune damage to the stomach lining can interfere […]

How calcium, PTH, vitamin D, kidney function, and urine calcium work together to clarify a possible parathyroid disorder. Primary hyperparathyroidism (PHPT) occurs when one or more parathyroid glands release hormone inappropriately for the calcium concentration […]

Direct answer: Nutrient deficiency symptoms can include fatigue, weakness, poor concentration, numbness or tingling, reduced exercise tolerance, mouth or tongue changes, and muscle symptoms, but none is specific to a deficiency. Focused blood tests for […]

Originally published: July 11, 2026 | Substantively updated: August 26, 2026 Fatigue, brain fog, low stamina, and poor recovery can feel like an iron problem—but the symptoms are not specific enough to identify the cause. […]

Originally published May 10, 2026. Updated August 26, 2026. Iron status is not one laboratory number. A serum iron result can change with meals, supplements, time of day, illness, and ordinary biological variation. Ferritin estimates […]

CBC and anemia blood tests evaluate the number, size, and distribution of blood cells and help organize common anemia and blood-cell patterns.1 A complete blood count with differential and platelets measures red cells, hemoglobin, hematocrit, […]

Neurological Blood Tests: The Direct Answer Neurological blood tests can help identify treatable or clinically relevant contributors to memory change, numbness, weakness, headache, balance problems, and other neurological symptoms. Common questions involve blood-cell patterns, glucose […]

Vitamin and nutrient deficiency tests are blood and, less often, urine tests used to investigate a defined question about low intake, malabsorption, blood loss, medication effects, pregnancy-related risk, a prior abnormal result, or possible supplement […]

Osteoporosis is a condition in which bones lose strength and become more likely to fracture. A central DXA scan measures bone mineral density and helps diagnose or classify osteoporosis, but it does not explain why […]

Vitamin D tests do not all measure the same form of vitamin D. Learn which blood test is generally used to evaluate vitamin D status, when D2 and D3 fractions may add context, and why […]

Magnesium for Sleep and Anxiety: What the Evidence and Lab Tests Can Tell You Magnesium is an essential mineral involved in hundreds of enzyme systems that support nerve signaling, muscle function, energy production, blood sugar […]

Nutrient deficiency means the body may not have enough of one or more vitamins, minerals, or related nutrients needed to support normal function. Because nutrients help support blood health, energy production, nerve function, immune balance, […]

Frozen shoulder, medically known as adhesive capsulitis, causes progressive shoulder pain, stiffness, and loss of movement. The condition develops when the connective-tissue capsule surrounding the shoulder joint becomes inflamed, thickened, and contracted. A frozen shoulder […]

Creatine monohydrate is widely known as a sports supplement, but its potential value extends beyond bodybuilding and competitive athletics. Creatine helps cells rapidly regenerate adenosine triphosphate, or ATP—the primary form of energy used by muscles, […]

Osteoporosis is a condition in which bones become weaker because bone mineral density, bone mass, or bone structure has changed. Weakened bones are more likely to fracture, sometimes after a minor fall, bump, or everyday […]

Dementia is an umbrella term for a decline in memory, reasoning, language, judgment, or other thinking abilities that becomes severe enough to interfere with daily life. Alzheimer’s disease is the most common cause, but vascular […]

The blood type diet claims that people should choose foods according to whether they have type O, A, B, or AB blood. Supporters suggest that blood type may influence digestion, metabolism, inflammation, weight, and the […]

Supplements can fill dietary gaps and support specific health goals—but more isn’t always better. Taking doses above the Tolerable Upper Intake Level (UL) or “stacking” multivitamins with single-nutrient products can tip you into vitamin excess, leading to symptoms […]

After a tough workout, your body doesn’t just need rest—it needs the right nutrients to repair, rebuild, and recover. Whether you’re training for a race, chasing PRs, or staying active and strong, what you eat and how your biology responds can make […]