Stress & Fatigue
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Cortisol is your primary stress hormone, produced by your adrenal glands. It regulates your energy levels throughout the day, your immune response, and how your body handles pressure.

Why we included it: Chronically high or low cortisol is at the root of burnout, fatigue, poor sleep, and anxiety — yet it's rarely tested in a standard checkup.

Thyroid-Stimulating Hormone (TSH) signals your thyroid gland to produce hormones that control your metabolism and energy levels. It's the primary screening marker for thyroid dysfunction.

Why we included it: An underactive thyroid is one of the most common — and most commonly missed — causes of persistent fatigue, weight gain, and brain fog.

Free T4 is the inactive thyroid hormone your body makes before converting it to the active form. Measuring the free (unbound) level gives a more accurate picture of thyroid output.

Why we included it: TSH alone doesn't tell the whole story. Free T4 helps confirm whether your thyroid is actually producing enough hormone to keep your energy stable.

Vitamin B12 is essential for energy production, red blood cell formation, and nerve function. Your body can't make it on its own — you have to get it from food or supplements.

Why we included it: B12 deficiency is surprisingly common, especially in people who eat plant-based diets or take certain medications, and it's a direct cause of fatigue, weakness, and brain fog.

Ferritin is the protein that stores iron in your body. It's the most sensitive marker of iron deficiency — your ferritin drops long before a standard hemoglobin test would flag anything abnormal.

Why we included it: Low ferritin is one of the leading causes of exhaustion, especially in women, and it often goes undetected because standard blood tests don't catch it early enough.

Vitamin D acts more like a hormone than a vitamin — it influences energy, mood, immune function, and even how well you sleep. Most people don't get nearly enough from sunlight alone.

Why we included it: Vitamin D deficiency is one of the most widespread nutritional deficiencies in the world and a major contributor to low energy, low mood, and weakened immunity.

HbA1c measures your average blood sugar over the past 2–3 months. Unlike a fasting glucose test, it gives a longer-term picture of how well your body is managing sugar.

Why we included it: Blood sugar dysregulation causes energy crashes, cravings, and persistent fatigue — even in people who don't have diabetes. Catching it early makes a huge difference.

High-sensitivity C-Reactive Protein (hsCRP) is the most sensitive blood marker of inflammation in your body. Chronic low-grade inflammation drains your energy and is linked to nearly every major chronic disease.

Why we included it: Inflammation is a hidden driver of fatigue that most people never test for. Knowing your hsCRP level helps explain why you feel run down even when everything else looks fine.