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Rationale's #1 serum — the strengthening anchor of the Essential Six daily routine, designed for combination skin types. The active stack reflects Rationale's depth: niacinamide for tone-evening, sodium ascorbyl phosphate for stable vitamin C, peptides (Argireline + Matrixyl-3000-family Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7), centella asiatica for soothing, plus multi-weight hyaluronic acid for layered hydration. The formulation density is consistent with the AU$220 price point and matches what you'd expect from a luxury-tier Australian cosmeceutical with 30+ years of in-house research. The Australian counterpart to a SkinCeuticals C E Ferulic at a different active focus.
Side-by-side ingredient breakdowns vs. the closest alternatives.
#1 The Serum (Strengthening Serum for Combination Skin) by Rationale is formulated for normal, combination skin. Rationale's #1 serum — the strengthening anchor of the Essential Six daily routine, designed for combination skin types. The active stack reflects Rationale's depth: niacinamide for tone-evening, sodium ascorbyl phosphate for stable vitamin C, peptides (Argireline + Matrixyl-3000-family Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7), centella asiatica for soothing, plus multi-weight hyaluronic acid for layered hydration. The formulation density is consistent with the AU$220 price point and matches what you'd expect from a luxury-tier Australian cosmeceutical with 30+ years of in-house research. The Australian counterpart to a SkinCeuticals C E Ferulic at a different active focus.
Yes, #1 The Serum (Strengthening Serum for Combination Skin) targets fine lines, dullness, redness. niacinamide + vitamin C + Argireline + Matrixyl-family peptides + centella + multi-weight HA is a remarkably dense active stack
#1 The Serum (Strengthening Serum for Combination Skin) retails for around $220, which places it in the premium range for serums. Check the "Where to Buy" section above for current retailer prices.
The main drawbacks to be aware of: luxury pricing (~AU$220) puts it in the prestige tier of Australian skincare; limited international retail — primarily Australia plus selective dermatologist and luxury hotel distribution; the Essential Six numbered system requires consumer education to navigate.
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