To maximize the benefits of retinal without irritating the skin, apply only a pea-sized amount in the evening very gradually (2 to 3 times per week at first), then follow your routine with a moisturizer and an SPF sunscreen during the day.

noli's read

Retinal (retinaldehyde) is a direct precursor to retinoic acid that requires only one conversion step in the skin, theoretically making it faster-acting than traditional retinol. A double-blind randomized clinical trial published in the Journal of Cosmetic Dermatology confirms that a 0.1% retinal application visibly improves skin texture, the appearance of fine lines, and skin radiance. Furthermore, a six-week prospective study published in the journal MDPI validates the efficacy of this concentration on skin firmness and the reduction of blemishes. The use of 'microspicules' to boost penetration is also supported by transdermal absorption research published in Molecular Pharmaceutics, demonstrating that they create temporary physical micro-channels that facilitate the passage of active ingredients. On the other hand, the idea that the intensity of the yellow color reliably and proportionally indicates the pure retinal concentration should be nuanced, as this hue can be influenced by other components in the formula. Finally, the gradual introduction combined with daytime SPF aligns perfectly with skincare consensus for preserving the skin barrier.

the sources

1. 1Green AC, Williams GM, Logan V, Strutton GM 2011
2. 2Hughes MCB, Williams GM, Baker P, Green AC 2013