F vitamin - complex of essential fatty acids.

Faex (yeast) - an extract, derived from yeast (Saccharomyces) contains glycides, B group vitamins, and nucleic acids. The high polysaccharide content (beta-glucan) not only helps to perfectly moisturize hair shafts but also enhances scalp protective properties against UV radiation and others, stimulates collagen and glycoprotein formation.

Fatty oils - sunflower, olive, corn and other oils can be used alone or included in cosmetic products for hair and skin, primarily effective for dry skin and hair as improves sebaceous glands excretion.

Finasteride - is a drug for the treatment of benign prostatic hyperplasia and male pattern baldness. It is a type II 5α-reductase inhibitor; 5-Alpha-Reductase, an enzyme, that converts Testosterone to Dihydrotestosterone (see next);

Five-Alpha-Reductase Enzyme - 5α-reductases, also known as 3-oxo-5α-steroid 4-dehydrogenases, are enzymes involved in steroid metabolism. They participate in 3 metabolic pathways: bile acid biosynthesis, androgen and estrogen metabolism, and prostate cancer. The function of 5α-reductases is to convert testosterone, the male sex hormone, into the more potent dihydrotestosterone.

Fragaria (strawberry) – botanic extract gives the skin freshness and elasticity, has calming, toning, anti-inflammatory effect, nourishes the skin, protects it from aging, toxins. Also, extract of strawberries perfectly moisturizes and nourishes hair, protects from the harmful effects of the sun rays, helps fight dandruff.

Fluoride - trace element required for the formation of bones and teeth, its lack or absence leads to dental caries, osteoporosis.

Folic acid - or vitamin B9, affects the blood, promotes hair growth.

Follicle - a hair root bag.

Folliculitis - an infectious disease of skin and hair.