Sunscreen preparations containing p aminobenzoic acid should be.. Applied 2 hrs before exposure

Sunscreen preparations containing p aminobenzoic acid should be:
a- Used sparingly
b- Applied 2 hrs before exposure***
c- Packaged in air-resistant containers
d- Packaged in light-resistant containers
e- Used only on arrears other than the face.

Para aminobenzoic acid is also called 4-aminobenzoic acid, or vitamin B10.
It is an organic compound that is used in many sun protection products and can be manufactured inside the human body indirectly by the beneficial E. coli bacteria in the intestine, so it is an unnecessary ingredient in food.
In some microbes, such as bacteria and yeast, para aminobenzoic acid is found naturally, and is used in the formation of vitamin B9 or folic acid, which enters the formation of DNA or RNA. In contrast, human cells must have folic acid in a ready - as in leafy vegetables - as they can not be synthesized by para aminobenzoyic acid.
Para aminobenzoic acid is a target for some antibiotics used to kill some bacteria, preventing its conversion to folic acid, thus not being a genetic material and thus eliminating bacteria.

Therapeutic uses include:
- Protective material against harmful sun rays:
It is used in a localized image on the skin, absorbs ultraviolet rays of type B, which cause damage to the genetic material of the skin cells and the possibility of mutations or even cancer.
- pyronie's disease:
 It is a defect in the erectile form of the penis in some men, where the penis is hostile rather than straight, which may cause pain during sex in the infected.
- Scleroderma:
It is a chronic disease - caused by a defect in the immune system - leads to the formation of large amounts of collagen protein - an important component of Gel D_, which increases the thickness and hardness of the skin.
- Other skin diseases such as vitiligo, inflammation of the muscles, skin and skin lymphoma.
- Infertility in women and lupus erythematosus (systemic lupus erythematosus).
- Arthritis, rheumatic fever and headache.
It is also used to prevent hair loss and increase grayish hair, making you look younger.
There are many sources in which we can get acid, such as:
- brewer's yeast.
- the black Honey.
- Animal organs such as liver and kidney.
Mushroom Mushroom.
- All types of grains (such as wheat, barley, corn and rice).
- spinach and bran.
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