Hair and puberty
These are both likely caused by the sex hormone testosterone, which is a major player in both female and male reproductive development. Testosterone is thought to increase the production of sebum which is the substance that can make both skin and hair feel oily.
Answer. This may be related to hormones, with the most common type of hormone associated with oil production being the androgen group (testosterone and similar hormones).
Androgens are the hormones mostly responsible for oil production, and sometimes they can fluctuate, stimulating an increase in sebum production. This often happens during puberty, just before menstruation, during pregnancy and during menopause.
Those with fine or thin hair, however, may find their hair looks greasy after just one day. It's all to do with the amount of oil your scalp produces, as well as how well your hair can carry that oil.
Overwashing Your Hair
It's not your imagination—the more you wash your hair, the quicker it may seem to need another wash. If you rinse your hair of its natural oils too frequently, it could be trying to overcompensate. Your scalp could be amping up oil production, which means greasier strands in record time.
Vitamin B deficiency is the hidden reason why most of the people have an oily scalp. Vitamin B helps in regulating oil production in your scalp and further manages the pH levels. Not having enough vitamin B can cause excess production of sebum in your hair due to an imbalance in the pH levels.
sebaceous gland, small oil-producing gland present in the skin of mammals. Sebaceous glands are usually attached to hair follicles and release a fatty substance, sebum, into the follicular duct and thence to the surface of the skin.
Your body's sebaceous glands naturally create the oily substance called sebum to help keep your hair shiny and your scalp moisturized and healthy. If too little sebum is produced, your hair can get dry and brittle—and if too much sebum is produced, your hair can get greasy.
People with oily hair or who use hair care products daily should consider washing their hair once every 1–2 days. People with dry hair can wash their hair less frequently. Those with textured or coily hair should only wash it once every 1–2 weeks.
“If you have oily scalp, then daily washing is needed,” she explains. “Sometimes, people think they have dry scalp because they have dandruff, but in those situations, more frequent washing is also helpful.”
Apply apple cider vinegar
Yes, the cooking staple can now be used to de-slick your greasy hair, too. “Apple cider vinegar has astringent properties that help remove excess oil from the skin,” says Joshua Zeichner, MD, director of cosmetic and clinical research in dermatology at Mount Sinai Hospital in New York.
"A sufficient intake of the B vitamins, particularly of vitamin B2 (riboflavin) and vitamin B6 (pyridoxine), can help combat greasy hair by regulating sebum production," the site explained. The good thing is, B6 is found in a lot of foods including beans, meat, poultry, fish, and some fruits and vegetables.
Wash your hair thrice a week
Washing your hair is the key step to get rid of an oily scalp. Your pores secrete oil from your glands and make your scalp greasy and oily. Regularly washing your hair with a suitable product will prevent your scalp from excessive oil build-up and keep your hair healthy.
Vitamin A helps to reduce the amount of sebum (the body's natural oil) which causes these by promoting cell turnover, exfoliating and removing dead skin cells from the epidermis. As a result, the skin and scalp are re-balanced, inflammation is reduced, hair growth is stimulated and scarring begins to heal.
Science supports the use of apple cider vinegar as a hair rinse. It could help strengthen hair and improve luster by lowering hair and scalp pH. It may also keep pesky scalp infections and itchiness at bay.
Why your hair gets greasy overnight. Hair gets greasy overnight as at night time your body produces more sebum. A normal substance, sebum coats and protects your hair shaft providing that glossy shine. Dirty pillowcases, washing too little or too often, and agitation as you sleep can all contribute to over production.
Some factors may contribute to the likelihood of developing an increase in sebum production. These factors include hormonal imbalances, metabolic disorders, digestive problems, poor scalp hygiene, and the accumulation of bacteria or fungi that irritate the scalp.
Androgens. Increased sebum production due to androgens' activity at the sebaceous follicle is a prerequisite for acne in all patients. High level of androgens, or hypersensitivity of the sebaceous glands to a normal level of androgens, causes an increase in sebum production.
Diets higher in protein and fiber and lower in saturated fats and refined carbohydrates work well for oily and acne-prone skin. To reduce sebum production, try a Paleolithic diet (rich in fruits, veggies, nuts, and lean meats) or a Mediterranean-style diet (rich in fruits, veggies, fish, olive oil, and legumes).