What are the necessary nutrients for hair growth?

Hair is a special tissue that is keratinized from the horny cells of the epidermis.

On the outside, hair is made up of hair roots and hair, and the part that shows the scalp is dry. The part under the scalp is the root hair. It is wrapped in the hair follicles.

We commonly known as "hair" is dry; located in the scalp hair root, hair follicle hair, wool accounted for only 10%~15% of the weight of the connecting structure of the root and the lower portion of the follicle called hair ball.

The hair can be divided into three layers from the outside to the inside:

The outermost layer is the epidermis, also known as Mao Xiaopi, which is the protective layer of the hair trunk. It is mainly against the physical and chemical factors of the outside, and slightly damages the hair. It is composed of 6~10 layers of long flake keratinocyte overlap arranged, free edge pointing to the hair, different hair shape, the strong degree of tension is also different. The closer the scaly material to the scalp is, the more smooth it is, the farther away the scalp is, the more rough and irregular it is, and the edges are slightly tilted or broken after varying degrees of stimulation from outside.curly hair extension

The middle layer is the most important part of hair, known as the cortex, which is distributed by the long axis of the bundle keratin chain along the stem. It determines the elasticity, strength, and toughness of hair. This layer accounts for less than half of the entire hair stem. Many melanin granules are also present in this layer.5piece hair extension

The innermost layer is the central part of the hair, called the medullary layer, surrounded by cells called the cortex, which is filled with air gap and has a certain function of preventing the outside heat. Similar to a long narrow tube that penetrates deep into the dermis and sometimes deep into the subcutaneous tissue.

The hair follicle is embedded in the hair follicle and the hair follicle structure is very complex. For the convenience of the study, different parts of the hair follicle are given different nomenclature.