Lumen Review: Does This Handheld Metabolism Tracker Work? – SPY

Lumen Review: Does This Handheld Metabolism Tracker Work? – SPY

Lumen is the world's first handheld, at-home metabolism tracker. Does it work?.
Lumen's tool uses a CO2 sensor and flow meter to determine CO2 levels in your breath. This level is a good indicator of the type of fuel your body is using to produce energy. Lumen is purchased along with a monthly subscription for the app, on which you can view all of your data. This subscription starts at $249 for a 6-month track or they're currently offering 40% off a 12-month track for new members starting at $299.

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