Act+Acre 2% Stem Cell H2-Grow Complex™ Scalp Serum for Hair Growth Versus Gentlehomme Hair & Beard Booster Serum With Anagain

This ingredient comes from a rare Swiss apple known as Uttwiler Spätlauber. It is produced from the cell cultures of the apple and not the fruit itself.

According to manufacturer studies, this ingredient has demonstrated the following benefits:

• Visible anti-wrinkle effect around the eye area (in vivo)
• Enhanced colony-forming efficiency of epidermal stem cells (in vitro)
• Improved ability of skin cells to regenerate and build new tissues in a 3D epidermis model (in vitro)
• Increased skin density (in vitro)
• Boosted vitality of epidermal stem cells (in vitro)
• Reversal of cellular aging signs in fibroblasts (in vitro)

Pentylene Glycol (1,2-pentanediol) is a multitasking little diol with three main roles in a formula:

Research on alkanediols (the family pentylene glycol belongs to) show they work by disrupting microbial cell membranes. This disruption helps the primary preservative system in a product work more effectively at lower doses.

Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.

So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.