Hydra Pen H3: How Simultaneous Serum Infusion Works

The short version: the Hydra Pen H3 is a microneedling pen with a built-in serum reservoir. Instead of applying serum first and then needling, it feeds serum through the cartridge as the needles create micro-channels — so the serum goes in while the channels are open. That simultaneous infusion is the main difference from a standard pen.

How simultaneous infusion works

A standard microneedling pen makes the channels; you apply serum separately, by hand. The Hydra Pen H3 holds serum in a small chamber attached to the cartridge and delivers it to the needle tips during use, so needling and infusion happen together. The result is more even, hands-free application right at the moment the channels are freshly made.

What it's good for

• Hydrating serums (such as hyaluronic acid) where even, immediate delivery helps.
• Hands-free, consistent coverage across the treatment area.
• At-home routines where you want needling and serum in a single step.

Using it well

• Use 33G (0.20 mm) EO-sterilized, single-use cartridges.
• Match depth to your goal — start shallow (0.25–0.5 mm) for routine use.
• Choose serums suited to freshly-needled skin: simple hydrating formulas (hyaluronic acid) rather than strong actives like retinol or acids right after.

See the Hydra Pen H3 →  |  H3/H5 cartridges →