Unless you use milk as a mask yourself, it will inevitably contain chemical components, but as long as it is within a safe range, it will be fine. So you should check the manufacturer of this mask, and then check other products of this manufacturer, such as Yumeijing or other cheap emulsion factories that also produce herborist. If there is a big factory, the quality is at least guaranteed, but if there is a small factory, it is hard to say. You know, extracting active ingredients from plants doesn't require equipment and technology like squeezing juice. The cost of equipment alone is beyond the reach of ordinary small workshops. So if it is a small factory, you should doubt whether there are natural things in it, not whether there are chemical components in it.