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Bring lab-grade biomarker testing to your clients.
For nutritionists, (sport) coaches, dietitians and every healthcare professional.
Join pro.biostarks.com

This is what we do.

“Cortisol detox” has become a popular concept, suggesting cortisol should be reduced or eliminated.
In reality, cortisol is not a toxin. It is a hormone essential to survival and, above all, a regulator of circadian timing. Cortisol rises in the morning to promote wakefulness, mobilises energy throughout the day, and declines in the evening to allow sleep and recovery. Health depends less on how much cortisol is produced than on when it is released.

Many symptoms attributed to “high cortisol” are often linked to a disrupted daily rhythm: morning fatigue, afternoon crashes and nighttime alertness. Rather than removing cortisol, understanding its pattern provides insight into sleep quality, recovery and metabolic regulation.

Cortisol is not harmful. Dysregulation is.

That is why we provide Cortisol analysis alongside Total Testosterone / Cortisol ratio in our Nutrition and Metabolic Health test kits.

Total cholesterol is a composite measure and, by itself, offers limited clinical insight.

Interpreting LDL, HDL and triglycerides allows evaluation of lipid transport and clearance pathways. These lipoprotein fractions describe how cholesterol is distributed, utilised and removed from tissues rather than simply how much is present in circulation.

Alterations in the lipid profile may reflect early metabolic imbalance, often preceding overt cardiovascular symptoms.

Our Metabolic Health test assesses the full lipid panel to provides an accurate view of cardiometabolic function.

Vitamin B12 (cobalamin) is an essential nutrient involved in neurological function and red blood cell formation.
It supports how the nervous system communicates, how oxygen is transported throughout the body, and how cells sustain daily energy production.

Suboptimal B12 levels are common and may gradually affect cognition, recovery and overall vitality, often without obvious symptoms at first.

We measure holotranscobalamin, the biologically active fraction of Vitamin B12.
Unlike total B12, which largely reflects circulating stores, holotranscobalamin represents the portion immediately available to cells, providing a more accurate view of functional status.

Measuring Active B12 offers insight into neurological and metabolic function, from mental clarity to physical endurance.

Both our Nutrition and Metabolic Health test kits include Active B12.
Link in bio to get started.

NAD⁺ (Nicotinamide adenine dinucleotide) is described as the molecule of longevity as it sits at the core of cellular energy production and repair.
It plays a key role in how cells generate energy, respond to stress and maintain long-term function.

With age, NAD⁺ levels naturally decline,
which is why it has become a growing focus in longevity and cellular health research.

Understanding your NAD⁺ status is the first step to understanding how your body is ageing, from the skin to the inside.

As interest in NAD⁺ continues to grow,
IV therapies and supplements such as NMN have become increasingly popular.
Clarity, however, starts with measurement.

Magnesium isn’t just a “supplement.”
It’s a key mineral involved in neuromuscular stability, energy metabolism and stress regulation.

Its levels are tightly regulated but can be affected by stress, dietary intake, metabolic health and increased physiological demand.

Magnesium deficiency is widespread.
According to the WHO, more than 20% of the global population may be biologically deficient with a much larger proportion showing insufficient intake.

That’s why assessment matters before considering correction.

Our Nutrition, Longevity and Metabolic Health test kits all include magnesium (Mg²⁺) analysis to support informed and biology-driven decisions.

Testosterone isn’t just a “virility” hormone.
It plays a key role in energy regulation, muscle maintenance, mood and metabolic function.

Its levels naturally decline with age but are also influenced by stress, sleep, nutrition,
and overall metabolic health.

From hormone therapy to simple dietary adjustments, solutions exist.
But they start with measurement.
Because you can’t address what you don’t measure and hormones are no exception.

Our Nutrition and Metabolic Health test kits measure your total testosterone (TT) level so decisions can be based on what your body actually needs.

NAD⁺ plays a central role in cellular energy, repair, and metabolic resilience. Its levels naturally decline with age but they can be measured.

Our NAD⁺ Longevity Kit provides a precise assessment of intracellular NAD⁺ alongside key minerals involved in healthy ageing, using laboratory-grade analysis engineered in Switzerland.

Because longevity isn’t about hope.
It’s about understanding your biology.

Meaningful health data starts with analytical precision.

From just four drops of dried blood, our proprietary platform uses high-resolution mass spectrometry to detect and quantify biomarkers at the molecular level with exceptional accuracy.

It enables accurate and reproducible laboratory-grade measurement of trace-level biomarkers across complex biological matrices.

Precision.
Engineered in Switzerland.