Crystal Retinal 1

Retinal: one step closer

Skin must convert any over-the-counter vitamin A to retinoic acid before it works. Retinol needs two conversion steps; retinaldehyde needs one, which is why research associates retinal with visibly faster results at equal tolerance. At 0.01%, this is the gentlest dose in the ladder: a genuine retinoid sized for a first-timer.

The crystal in the name

Retinaldehyde is notoriously unstable, light and air destroy it. Here each molecule is caged in cyclodextrin, a sugar lattice that shields it in the bottle and releases it gradually through the night, flattening the irritation spike that gave retinoids their fearsome reputation.

The support crew

Squalane, hyaluronic acid and glycerin cushion; two vitamin C esters ride along as stabilisers and daytime-defence partners; carrot seed and cloudberry oils bring the vitamin-A-adjacent botanicals. The soft scent is vanilla and tonka, with coumarin declared, noted below.

The ladder logic

Crystal Retinal is designed as a progression: start at 1, and when skin shrugs at it, typically after a bottle or two, step up. Strength is earned, not chosen.

首次使用视黄醇类产品的人、因使用视黄醇而出现问题的敏感肌，以及任何开始 CSA 护肤法中维生素 A 环节的人：白天用 C，始终涂防晒，晚上用 A。

值得了解

孕期或哺乳期禁用，这适用于所有视黄醇类产品。使用前几周可能会出现轻微干燥或脱皮，之后会逐渐稳定。含有香草和扁豆提取物，并标明含有香豆素，若对香料过敏，请进行局部测试。关于处方级强度的咨询，请联系我们的临床团队。

每晚在清洁干燥的肌肤上使用：取豌豆大小的用量涂抹于面部，避开眼周和唇部。开始时每周使用两到三晚，根据耐受程度逐渐增加至每晚使用。如果感觉肌肤干燥，之后再涂抹保湿霜。

每天早上都必须使用高倍数防晒，毫无例外。视黄醇和防晒是不可分割的组合。

搭配使用

CSA 晚间护理程序，白天使用任何 C-Tetra，晚上则使用这款。刚开始使用时，非视黄醇晚间护理可继续使用 Press & Glow 或 Press & Clear。它与 Retinol Brulee 和 Bakuchiol Complete（孕妇可用替代品）同属入门级视黄醇产品：每次仅在晚上使用一种视黄醇产品；待皮肤适应后，再升级至 Crystal Retinal 3、6、10、20 系列。