Product safety and ingredients

most. hair building fibers are a cosmetic product for use on hair. This page states plainly what is in them, how to use them safely, who should avoid them, and how to report a problem.

What is in most. hair fibers

most. hair fibers contain cotton cellulose, cellulose gum, sodium chloride and mineral pigments (CI 77491, CI 77492, CI 77499, CI 77891). The full list is printed on every bottle and published on the ingredients page. most. contains no keratin, no wool protein, no ammonium chloride, no parabens and no added fragrance.

How to use the product safely

• For external use on hair only. Keep away from the eyes and do not inhale the powder.
• Apply over a sink, in a place with normal ventilation, and avoid dispensing directly toward the face.
• Do not apply to broken, irritated or sunburnt skin, or to an area that has just been treated surgically until a doctor or surgeon says it is fine.
• Keep out of reach of children.
• Store at room temperature, away from damp.

Who should not use it

Anyone with a known sensitivity to cotton, cellulose or iron oxide pigments should avoid most. hair fibers. If you have a scalp condition, are undergoing treatment, or are unsure for any reason, ask a doctor or dermatologist before use, and show them the ingredient list.

What to do if you have a reaction

Stop using the product and rinse the area with water. If irritation continues, seek medical advice. Report the reaction to most. at hello@mosthairfibers.com with the shade, the batch code from the bottle and a description of what happened. most. records every report, responds to you directly, and passes serious adverse events to the relevant authority where the law requires it.

What most. is, and is not

most. hair fibers are cosmetic. They change how hair looks by attaching to existing strands. most. does not treat, cure or prevent hair loss or any medical condition, does not stimulate growth, and is not a substitute for medical advice. Nothing on this site is medical advice.

Packaging and disposal

The bottle and the carton are recyclable where local facilities accept them. The period after opening is printed on the label.

Reporting a safety concern

Email hello@mosthairfibers.com. Include the batch code, the shade and photographs if relevant. most. replies to safety reports before any other kind of message.

Last updated August 2026.