Some common ingredients to not mix. Some can have bad effects and others could just negate each other, therefore, wasting product.
AHAs/BHAs
You've probably heard a lot about AHAs and BHAs. Here is an article I love and think is very informative about differences and benefits.
AHAs- typically better for exfoliation and anti-aging
BHAs- typically better for more acne-prone or inflamed skin
Using both together has benefits, but always check or alternate when using products as to keep your skin in the best balance.
skin types
all info was gotten from here and more for each skin type!
oily skin
"‘Oily’ is used to describe a skin type with heightened sebum production. An over production is known as seborrhea.
The causes of oily skin
A number of issues trigger the over production of sebum:
genetics
hormonal changes and imbalances
medication
stress
comedogenic cosmetics (make-up products that cause irritation)"
dry skin
"‘Dry’ is used to describe a skin type that produces less sebum than normal skin. As a result of the lack of sebum, dry skin lacks the lipids that it needs to retain moisture and build a protective shield against external influences. This leads to an impaired barrier function."
"Significantly more women suffer from dry skin than men and all skin gets dryer as it ages. Problems related to dry skin are a common complaint and account for 40% of visits to dermatologists. "
combo skin
"an oily T-zone (forehead, chin and nose)
enlarged pores in this area perhaps with some impurities normal to dry cheeks"
Ashtine is this one :)
normal skin:
"‘Normal’ is a term widely used to refer to well-balanced skin. The scientific term for well-balanced skin is eudermic. The T-zone (forehead, chin and nose) may be a bit oily, but overall sebum and moisture is balanced and the skin is neither too oily nor too dry."
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