Most hyaluronic acid serums are a lie. One molecule size just sits on top—feels wet for 30 seconds, does nothing.
Biojuve figured out that skin is layered. So they made HA in four different weights. Tiny ones drill deep. Big ones seal the surface. It’s the only HA serum I’ve tried that actually feels like it went *somewhere*.
It’s $68 for 1 oz. Not cheap. But the claim is that each molecule weight hits a different skin layer—superficial, mid, deep, and ultra-deep. Most brands stop at two.
Ultra-Low (8kDa)
Penetrates the dermis—where collagen lives. Most HA can’t even get past the surface.
Low (50kDa)
Sits in the mid-epidermis. This is where you actually hold water long-term.
Photo: Karly Jones / Unsplash
HA alone won’t save you if you’re dry. This has a tripeptide (copper peptide, specifically) that signals repair, plus squalane for lipid barrier support. The fourth weight is the real flex—most brands don’t bother with ultra-low because it’s expensive to stabilize.
- 4D Hyaluronic Acid (4 molecular weights): Hydrates every layer, not just the top
- Copper Tripeptide-1: Wound healing + collagen signal—not just an antioxidant
- Squalane (Plant-Derived): Mimics your skin’s natural oils. Non-comedogenic
- Panthenol (Pro-Vitamin B5): Calms irritation. Stops the “tight” feeling after cleansing
Photo: Sonia Roselli / Unsplash
Texture is watery-gel. Absorbs in maybe 8 seconds. No film. No tackiness—I actually checked my mirror twice because I didn’t believe it.
Week two: my forehead lines looked less like creases and more like… skin. Weirdest part? My T-zone stopped overproducing oil. Skin stopped panicking and trying to compensate for dehydration.
Fine lines on my forehead softened by week three. Pores looked smaller—not shrunk, just less… hungry. My skin stopped feeling tight after washing. No new breakouts, which is rare for me with serums.
Biojuve’s 4D HA is the only HA serum I’ve finished and re-bought. It’s not magic—it’s just actually formulated for skin that has more than one layer.