I've been a Seek Space regular since 2021, and I buy most of my products in my regimen here.
I used to use a different Vitamin C serum until I noticed that I hit a plateau and that it stopped working. I realized that I had already developed a tolerance for it over time, so I consulted Seek Space for a product with higher potency and concentration. They recommended Isntree's new Vit. C serum and I don't regret trusting their recommendation once again since I'm also an Isntree avid fan.
3 months into using it, I can say that it works wonders for the skin especially if you target to have "glass" skin -- healthy, hydrated, and glowing. Never, not once, I experienced a stinging sensation when I used it and despite its high concentration level, it doesn't leave my skin feeling tight and dry. I've gotten a lot of compliments on my skin and some people even thought I'm younger than my actual age. I'm already 32 and a lot has mistaken me for a 25-year-old.
The packaging is well-thought-of as well! It's kept in a dark, opaque bottle to prevent oxidation which is highly common among Vitamin C serums. Isntree was intentional with this entire line!
If you're looking for a Vitamin C serum that does its job and more, Isntree's one to look out for. Optimal results, of course, are achieved with the right products to use with it such as sunblock which is a must if you're using a potent serum.