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PLUNA glossary.

The words behind cold plasma skin care and PLUNA, in plain language.

By the PLUNA team · Updated November 2026

Cold plasma
Energized air. Energy is added to a gas, not heat, creating plasma that can operate near skin temperature. Also called low-temperature atmospheric-pressure plasma.
Plasma
Often called the fourth state of matter: a gas given enough energy that some of it becomes electrically charged. Industrial plasma is made in a vacuum at thousands of degrees; cold plasma forms at normal air pressure, at body-safe temperatures.
NoZone Cold Plasma (NCP)
FEAGLE’s technology, designed to keep ozone and nitrogen oxides controlled while keeping the plasma dense and steady. Making plasma can create those gases, and simply turning the plasma down weakens it.
U-Turn Technology
PLUNA’s patented pathway that recirculates and controls the plasma inside the head, for a dense, steady output across the treatment surface. The discharge that creates the plasma never touches the skin directly.
Booster Gel Serum
JOYDEW Pink Soothing Booster Gel Serum, the gel every PLUNA treatment starts with. A daily booster gel serum for hydration, soothing and moisture care; it can also be used on its own.
CPEE
The process behind the gel’s four botanical-derived ingredients: botanical extracts processed with cold plasma, not heat. The four are guava leaf, Baikal skullcap root, German chamomile and prickly pear stem.
Face Mode
Five minutes, purple light. The daily treatment across the whole face, with the General Tip.
Line Mode
Three minutes, green light. For expression lines around the eyes and mouth, with the General Tip, or the Narrow Tip on smaller areas.
Spot Mode
One minute, red light. For small, targeted areas, with the Narrow Tip held still.
General Tip
The tip for daily Face and Line modes, with maximum coverage. Start here.
Narrow Tip
The tip for Spot Mode and small, targeted areas.
Hair & Body Tip
The tip for the scalp, hairline, neck, chest, back and larger body areas.
Exhaust port
The vent at the back of PLUNA. Keep it clear; the fan runs for 5 seconds after the device stops.
Day 5
The point at which visible change may begin with recommended daily use. It is not a guarantee.
Redness index
An instrument reading of how red the skin is. Lower is calmer.
Skin replica roughness
Surface roughness measured from a cast of the skin, for example beside the eye or along the nasolabial fold. Lower is smoother.
Inner skin moisture
Water content read 2.5 millimetres below the surface, not on it. Higher is more hydrated.
Control group
People in a study who do not get the treatment, used for comparison. The 2024 PLUNA study had none.
Instructions for Use
The document that ships with PLUNA. It lists contraindications, warnings and precautions.
ISO 9001 and ISO 13485
Quality management certifications held by PLUNA’s maker. ISO 13485 covers quality management for medical devices. They are not a medical device clearance or approval.
FEAGLE
The Korean plasma company in Yangsan, South Korea, founded in 2014 by Professor Kim Gyoo-cheon, that engineers PLUNA.
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Booster Gel Serum delivered every month for $25.50 plus $8 shipping, 15% off. Skip or cancel anytime. Subscribing in the same order as your PLUNA takes $100 off the device.

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