Understand What 
We Measure – and 
Why It Matters

Transferrin is a protein that binds to iron in the blood. It takes iron molecules to cells so they can carry out several important functions, including energy production.

Transferrin is a protein produced in your liver that regulates the amount of iron absorbed by the blood. Transferrin saturation assesses your iron stores to see how much you have in your system.

Triglycerides are a type of fat in your blood, and the main storage form of fatty acids in your body. They're stored in your liver and muscle tissue as energy for when you need it. They are also known as 'blood fats'.

Thyroid-stimulating hormone (TSH) is a hormone that helps regulate your thyroid gland, which affects how your body functions. If it's not working properly, it can cause problems like fatigue, hair loss, weight gain or depression.

Urea is a waste product formed in the liver during protein metabolism and excreted by the kidneys. Blood urea levels reflect protein intake, hydration status, and, to some extent, kidney function.

Uric acid is a byproduct of DNA and cell renewal. It's a waste product that also forms in your body when you digest protein. It’s found in many foods, especially meats and fish, but also in some vegetables and grains.

Vitamin B12 is a water-soluble vitamin that you get from foods and supplements. It's involved in many processes, including the production of red blood cells and DNA, metabolism, and brain function.

Vitamin B2, or riboflavin, is a water-soluble vitamin that's essential for general health. It plays a vital role in the digestive system and helps keep your liver, eyes, nerves, muscles, and skin healthy.

Vitamin B6 is a water-soluble vitamin and essential nutrient you need to get through your diet. It supports brain development and helps your nerves and immune system function properly.

Vitamin B9, also known as folate or folic acid, is a water-soluble vitamin that’s found naturally in many foods. It plays a vital role in the formation of DNA and red blood cells and supports brain function.

Vitamin D is a fat-soluble nutrient you can eat and a hormone your body makes in response to sun. It promotes the absorption of calcium and phosphorus from foods to help you build strong bones and teeth.

Zinc is a trace mineral that supports DNA production, the immune system, and metabolism. It’s sometimes called the “beauty mineral” because it's involved in maintaining your skin, nails, and hair.