Side-by-side comparison

Haruharu Wonder Black Rice Hyaluronic Serum vs Medik8 Crystal Retinal 6

Both are serums. They share a 66% active-ingredient overlap, so the real decision is about price, texture and the supporting ingredients. Here's the side-by-side.

66%Active overlap
Haruharu Wonder
Black Rice Hyaluronic Serum
SerumBudgetMorning or evening
DullnessDrynessDamaged Barrier

Fermented black rice extract with niacinamide and hyaluronic acid. Antioxidant-leaning hydrator rather than a targeted active — a good 'daily vegetable' layer under stronger serums.

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Medik8
Crystal Retinal 6
SerumLuxuryEvening only
Fine LinesPhotoaging PreventionRough Texture

A stabilised retinaldehyde serum (0.06%) with hyaluronic acid and vitamin E, sitting between retinol and prescription tretinoin in strength. Faster-acting than retinol with good tolerability; part of a tiered ladder you climb gradually.

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The verdict

Which should you choose?

On price, the Haruharu Wonder Black Rice Hyaluronic Serum sits in the Budget tier versus Luxury for the Medik8 — so it's the more budget-led pick if the overlap is what you're after. On how you'd use them, the Haruharu Wonder is flagged Morning or evening while the Medik8 is flagged Evening only. The Haruharu Wonder leans toward Damaged Barrier, Dryness, Dullness. The Medik8 leans toward Fine Lines, Photoaging Prevention, Rough Texture.

The overlap

What they share

At 66% active overlap, these are the ingredients doing comparable work in both formulas:

Hyaluronic Acid
The formulation

Ingredient stacks, side by side

Haruharu Wonder — top of the list

  • Oryza Sativa (…~50–80%
  • Water~5–25%
  • Butylene Glycol~3–10%
  • Niacinamide~2–6%
  • Bambusa Vulgar…~1.5–4%
  • Dipropylene Gl…~1–2%
  • Glycerin~1–2%
  • 1,2-Hexanediol~1–2%
  • Sodium Hyaluro…~1–2%
  • Hyaluronic Acid~1–2%

Medik8 — top of the list

  • Aqua~50–80%
  • Glycerin~5–25%
  • Caprylic/Capric…~3–10%
  • Dimethicone~2–6%
  • Retinal~1.5–4%

● marks ingredients that appear near the top of both lists. Percentages are positional estimates from INCI order, not disclosed doses.

At a glance

The specs

Haruharu WonderMedik8
CategorySerumSerum
Price tierBudgetLuxury
Best forDullness, Dryness, Damaged BarrierFine Lines, Photoaging Prevention, Rough Texture
Usage notesMorning or eveningEvening only
Active overlap66% — Hyaluronic Acid
Questions

Common questions

Is the Haruharu Wonder Black Rice Hyaluronic Serum or the Medik8 Crystal Retinal 6 better?
Neither is universally better — they share 66% active-ingredient overlap, so for the actives that drive results they're close. The Haruharu Wonder Black Rice Hyaluronic Serum is the more budget-friendly option, while the other may differ on texture, finish and supporting ingredients. Pick based on your skin's priorities rather than a single 'winner'.
What's the difference between the Haruharu Wonder Black Rice Hyaluronic Serum and the Medik8 Crystal Retinal 6?
Both are serums that share Hyaluronic Acid. Where they differ: they sit in different price tiers (Budget vs Luxury); the Haruharu Wonder is Morning or evening; the Medik8 is Evening only; the Haruharu Wonder targets Damaged Barrier, Dryness; the Medik8 targets Fine Lines, Photoaging Prevention.
Are the Haruharu Wonder Black Rice Hyaluronic Serum and Medik8 Crystal Retinal 6 dupes for each other?
They share 66% active-ingredient overlap based on published INCI lists, so one can stand in for the other on the actives that matter — chiefly Hyaluronic Acid. A dupe matches the hero actives, not the full sensory experience, so expect differences in texture, fragrance and exact concentrations.
Can I use the Haruharu Wonder Black Rice Hyaluronic Serum and Medik8 Crystal Retinal 6 together?
They both fill the serum slot in a routine, so you'd normally pick one rather than layer both. If you want to use both, treat one as your daytime option and the other for evening, and patch-test when introducing anything new.
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85% overlap

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