This hair serum has been giving life to my dull, dry locks for 6 years

In my home state of Michigan, muggy summer days are spent lounging by the lake, my blonde strands absorbing every ray of sun while pulled into a sweaty bun. Winter weekends are marked by the dry heat pumping throughout my house and the sudden, windy snowstorms (and ensuing hats and scarves) that create annoying tangles in my hair. Even though I adapted to the fluctuating weather, my fine tresses were never able to cope with the shifts in humidity and constant knots.

That is, until my best friend let me borrow her BioSilk Silk Therapy Hair Serum. After a single use, my hair was softer, smoother, and looked healthier than ever before. The formula contains actual silk proteins (which naturally have 17 of the 19 amino acids that are found in hair) to give your locks the same glossy, frizz-free look they have after a much-needed day of pampering and recovery at the salon. And the leave-in product actually smells like you visited a top-of-the-line stylist (yeah, you know that clean, hard-to-put-into-words scent I’m talking about).

What makes BioSilk Silk Therapy Hair Serum stand out from all the serums on your drugstore’s shelf (along with the mass of beauty products featured on Instagram), is its ability to fight split ends. Those silk proteins go to work on reconstructing your strands, helping to fill in any voids in the cuticle layer (aka the outermost protective layer) while strengthening and protecting it from future damage. But if my word isn’t convincing enough, know that my hairstylist hasn’t pointed out any frizzy, broken ends since I began incorporating the hair serum into my routine six years ago.

Yes, I’ve been using BioSilk Silk Therapy Hair Serum after every shower since the series finale of How I Met Your Mother. And since a nickel-sized dollop is enough to do some miracle-level restoration on the hair shaft and tips, one 6-ish-ounce bottle can last at least six months. Half a year of hair that literally feels as smooth as silk for the same price as one week’s worth of Starbucks? I’ll skip the lattes.

BioSilk Silk Therapy Hair Serum

Shop it! $28—$49.50, ulta.com

This story originally appeared on Shape.com by Megan Falk.