Please allow me to comment. - Yellow like this still works. If it turns yellow-orange like rust-colored paint, discard it.
Vitamin C is fully degraded - I think the concentration of
L-ascorbic acid should not affect Oxidize. I think that Oxidize is caused by exposure to light. and the weather often concentration of
L-ascorbic acid should have an effect on skin irritation. - May change from dropper bottle to opaque pump bottle or airless pump to reduce exposure. light and the weather often It will help reduce the Oxidize to slow it down. - Should not have to mix the color of the product is yellow here. because it will not make it look like
วิตามินซี is it deteriorating? The product should be transparent, not mixed with color in order to determine whether
วิตามินซี is it bad? If not, do not use it.
วิตามินซี Alzheimer's
วิตามินซี is ineffective at all and may harm your skin, thank you.