Biomarker guide

What your blood test means.

Plain-English guides to common biomarkers, optimal ranges and the evidence-led supplements that help. Or upload your labs for a personalised read.

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THE SHORT ANSWER

Blood biomarkers like ferritin, vitamin D, B12, and HbA1c show where your nutrition actually stands. A low or high result points to specific, evidence-led supplement and diet changes. Each guide explains what the marker means, its optimal range, and what to do when it runs low or high. Education, not medical advice.

Vitamins

Vitamin D (25-OH)
Drives immune function, mood, bone health, and calcium handling.
Vitamin B12
Essential for nerve function, energy, and red blood cells.
Folate
B-vitamin needed for DNA synthesis and methylation.
Vitamin B6
Cofactor for neurotransmitter synthesis and homocysteine clearance.

Blood / iron

Ferritin
Iron storage.
Serum Iron
Circulating iron available for red blood cell production.

Minerals

Magnesium (serum)
Cofactor in 300+ reactions.
Zinc
Immune function, testosterone, wound healing, taste/smell.
Selenium
Antioxidant cofactor and key to thyroid hormone conversion.

Thyroid

TSH
High TSH suggests an underactive thyroid; low suggests overactive.
Free T4
Circulating thyroid hormone.

Metabolic

Fasting Glucose
Blood sugar after fasting.
HbA1c
Average blood sugar over ~3 months.

Lipids

Total Cholesterol
Overall cholesterol.
LDL Cholesterol
The 'bad' cholesterol carrier most associated with cardiovascular risk.
HDL Cholesterol
The 'good' cholesterol.
Triglycerides
Blood fats.

Inflammation

hs-CRP
Sensitive marker of systemic inflammation and cardiovascular risk.
Homocysteine
Elevated levels signal a methylation/B-vitamin shortfall and raise cardiovascular risk.

Hormones

Total Testosterone
Primary male androgen (also important in women at lower levels).