Topical Vitamin C offers a wide array of benefits to the skin. However, many forms of Vitamin C and many more formulations of Vitamin C are available commercially with a potential to confuse the audience. We have developed a guide that offers guidance on the formulations of Vitamin C offered under The Ordinary range. It also offers education on Vitamin C itself and on the differences between formulations of Vitamin C at large. 

Note: The format of this formula is a suspension of very fine L-Ascorbic Acid powder and, as such, provides the most direct exposure of extremely high concentrations of Vitamin C topically. With such format, there are 2 important things to consider:

1) A very strong tingling but non-irritating sensation is expected during the first 1-2 weeks of use until the skin's tolerance to such high exposure is elevated. If the sensation is too strong to tolerate, the formula can be mixed on each application with other creams or serums of your preference.

2) The powder exposure to the skin disallows the formula to feel like a serum, lotion or cream and each application requires a few seconds to feel absorbed by the skin. This formula feels gritty for a few seconds after application. If you prefer to avoid this gritty feel, we suggest our Vitamin C Suspension 30% in Silicone.

Alternative products on the market offer suspensions of Vitamin C in water-free formulations in heavier silicone bases to avoid the "powdery" feel of the suspension. These formulations do keep the Vitamin C stable but they are almost always offered in heavier silicone bases that interfere with efficient exposure of the entire Vitamin C content to the skin (the silicone entraps the Vitamin C). Our formula avoids the use of silicones and offers complete and direct exposure of the entire powder content to the skin, maximizing topical delivery. If you prefer a lighter silicone base instead for a smoother skin feel, we suggest our Vitamin C Suspension 30% in Silicone.

Directions

Apply a small amount to face in the AM or the PM (PM preferred). Avoid contact with the eyes. A tingling sensation can be expected after application. If the sensation is too strong to tolerate, the formula can be mixed on each application with other creams or serums of your preference. If irritation occurs, cease use and consult a physician. Use only as directed on unbroken skin. Patch testing prior to use is advised. Refer to our in-depth guide to patch testing. Keep out of reach of children.

維他命C是一種有效的抗氧化劑，而純粹的左旋維他命C形式被證實能逆轉皮膚衰老的多種症狀，外敷更能提亮膚色。本配方不含水和矽酮，因此能提供23%的純左旋維他命C，使其在無水環境下保持完全穩定的狀態。除維他命C能帶來的功效以外，本產品更是添加了無水透明質酸微粒，讓肌膚更加光滑。睡前使用效果更佳。

備註：根據用戶建議，本配方現推出軟管包裝形式，使之更容易滴塗。

本產品為23％左旋維他命C粉末的無水懸浮液。The Ordinary的維他命C系列產品包括以下配方：

30%維他命C亮白精華乳 (Vitamin C Suspension 30% in Silicone)
23%高純度維他命C+2%玻尿酸微珠 (Vitamin C Suspension 23% + HA Spheres 2%)
100%左旋C粉 (100% L-Ascorbic Acid Powder)
12%維他命C配糖體溶液 (Ascorbyl Glucoside Solution 12%)
20%脂溶性維生素C + 維他命F (Ascorbyl Tetraisopalmitate Solution 20% in Vitamin F)
10%抗壞血酸磷酸酯鎂 (Magnesium Ascorbyl Phosphate 10%)
8%左旋C酸 + 12%Alpha熊果素 (Ascorbic Acid 8% + Alpha Arbutin 2%)
15%乙基維他命C酸 (Ethylated Ascorbic Acid 15% Solution)

局部使用維他命C對皮膚有多種益處。然而，維生素C有多種類型，市面上的維生素C配方則更多，這就有可能使消費者產生混淆。因此我們起草了一份指南，為"The Ordinary"提供的維他命C配方作出指導說明。該指南還提供關於維他命C本身的介紹以及維他命C配方之間的差異。

備註：本配方的構成為極細左旋維他命C粉末的懸浮液，因此，提供了極高濃度的維生素C直接作用於皮膚表面。使用此配方須考慮到以下重要的兩點：

1) 預計在使用的前1-2週會有非常強烈但非刺激性的刺痛感，直到皮膚對這種高度直接作用的耐受度有所提高。

2) 粉末直接接觸皮膚不會使配方感覺像使用精華液、化妝水或面霜那般舒適，並且每次使用需要幾秒鐘才能感覺到已被皮膚吸收。如果需要，每次使用時可在乳膏基質中稀釋該製劑，以使皮膚隨使用時間的增加產生耐受性。

市場上的替代產品提供維生素C在矽酮基質中的無水製劑懸液，以避免懸液的"粉末"感。這些製劑雖然能保持維生素C的穩定性，但它們的矽酮基質總是比較濃重，從而乾擾整個維生素C含量有效地和皮膚充分接觸(矽酮包埋了維生素C)。而我們的配方避免使用矽酮，並使全部粉末完全且直接地作用於皮膚，最大化利用滲透效果。

功效成分Active Ingredients

L-抗壞血酸、玻尿酸鈉

使用方式Directions

日間或晚間將少量產品塗抹於臉部。塗抹後預計會產生輕微的刺痛感。