Glutathione Index Blood Test

The Glutathione Index Blood Test measures reduced glutathione (GSH) and oxidised glutathione (GSSG) to assess antioxidant capacity and redox balance using a simple at-home dried blood spot sample.

Glutathione is often referred to as the body’s master antioxidant. It plays a central role in protecting cells from oxidative stress, supporting detoxification pathways, maintaining immune resilience, and regulating cellular repair mechanisms. The balance between reduced glutathione (active form) and oxidised glutathione reflects overall redox status and the body’s ability to manage oxidative load.

The Glutathione Index Blood Test provides clinically relevant insight into oxidative stress and antioxidant defence. A lower GSH:GSSG ratio may indicate increased oxidative burden, environmental stress exposure, metabolic strain, or impaired recovery capacity. Because glutathione is involved in mitochondrial protection and detoxification processes, monitoring its status can support long-term metabolic optimisation and resilience.

This test may be particularly valuable for individuals focused on longevity, inflammation balance, performance recovery, immune health, or those exposed to high oxidative stress from lifestyle or environmental factors. Measuring both reduced and oxidised forms allows for a more comprehensive evaluation than total glutathione alone.

All samples from the Glutathione Index Blood Test are analysed in certified laboratories and include clear reference ranges to support informed, evidence-based decisions regarding nutrition and supplementation.