Penetraitt Overnight Repairing Serum with Hyaluronic Acid is a no-rinse leave-in hair serum built around hyaluronic acid (as sodium hyaluronate) and niacinamide — actives more commonly associated with skincare than traditional oil-based hair serums. It's part of Sebastian Professional's Penetraitt line for hair described as being 'in recovery mode': color-treated, over-styled, or mechanically damaged strands that need ongoing moisture support rather than a single rinse-out fix.
Where a typical hair serum relies on oils or silicones to smooth the hair's surface, this formula leans on hyaluronic acid's ability to bind and hold moisture at the strand level, paired with niacinamide, an ingredient used in hair care (as in skincare) to support the look and feel of a healthier surface. The serum is designed to be applied and left on overnight rather than rinsed out, so its effects build while hair isn't being handled, brushed, or exposed to additional heat styling.
To use, it's applied to dry or damp hair before bed and left in; hair is then styled as usual in the morning without a rinse step. Because it's a leave-in, humectant-based formula, results depend somewhat on the surrounding environment — humectants like hyaluronic acid work best when there's some ambient moisture to draw from, and heavy application in a very dry or very humid environment can change how the finish feels the next day. It's intended to complement, not replace, the rinse-out steps of the Penetraitt system, such as the Rescue Repair Shampoo and Mask, rather than functioning as a stand-alone repair treatment.
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