So… What Exactly Is the Tidal Deep Hydration + Plumping Serum?

Why Would You Even Want This?

Most hydrating serums feel great for an hour, then your skin is tight and dull by afternoon — because they only work on the surface. Tidal is engineered differently. The five hyaluronic acid technologies target different layers of the skin simultaneously, so you’re saturating it, not just coating it.

The polyglutamic acid is the real secret weapon — it holds up to five times more moisture than hyaluronic acid alone. Pair that with vegan lotus-derived mucin (which mimics traditional snail mucin without any animal involvement) and silk peptides that help your skin produce more of its own moisture-locking protein. The retail price is $85 for a full ounce, which is why a free sample is such a great way to try it first.

Who Is This Perfect For?

What Do You Actually Do With It?

Tidal is your hydration step — after cleansing, before moisturizer. Here’s exactly how to use it to get the most out of your sample:

• 1
  Start with a clean face. Cleanse and pat skin dry, or leave it slightly damp — hyaluronic acid works even better when there’s a little moisture already on the skin.
• 2
  Pump 1–3 times into your palm. A little goes a long way. For a 5ml sample, start with 1 pump to make it last and see how your skin responds.
• 3
  Press and massage into face and neck. Don’t rub — press in with your fingertips using gentle upward motions so it absorbs rather than sitting on the surface.
• 4
  Follow with moisturizer. Seal all that hydration in with your usual moisturizer on top. This is key — it locks everything in even longer.
• 5
  Use morning and evening. Gentle enough for twice-daily use. Morning gives you that plumped, dewy glow all day; evening lets the barrier-repairing ingredients work overnight.

A Few Tips Before You Go

• Follow @sundayriley first, then comment. Instagram only allows DMs from accounts you follow. If you comment without following, they literally cannot send you a message. This is the #1 reason people miss out — don’t skip this step!
• Check your DM requests folder. Brand messages often land in “Message Requests” — not your main inbox. Go to Instagram → DMs → tap “Requests” at the top if you don’t see it right away.
• Don’t wait on this one. Sunday Riley says quantities are limited. These drops go fast from a brand with 628K+ followers. Comment as soon as you can.
• Turn on post notifications. Tap the three dots on their profile → “Turn on Post Notifications” so you’re first to know when they drop the next freebie.
• Google “Sunday Riley Tidal serum” to read reviews first. There are real user reviews on Sephora, Ulta, and Reddit worth reading while you wait for your sample to arrive.
• Share your experience when it arrives. Tag @sundayriley in a Story. Brands remember engaged followers and often send more samples to people who share their experience.

Sunday Riley has built a reputation for high-performance, science-backed skincare since the brand launched in Houston, Texas. They’re B Corp certified, PETA-certified cruelty-free, and Leaping Bunny approved. Getting a free sample is a great way to experience that formulation quality firsthand before spending $85 on the full size.