Hair growth products can contain a variety of ingredients, both natural and synthetic, that are intended to promote hair growth and prevent hair loss. Some of the most effective ingredients for hair growth include dihydrotestosterone (DHT) blockers and inhibitors, which can be found in various over-the-counter and prescription medications. The two ingredients approved by the FDA for hair regrowth are minoxidil and finasteride. Other ingredients that may be helpful for hair growth include:

• Iron: An iron deficiency is often associated with hair loss, and iron supplements can help with regrowth.
• Collagen: Collagen is a protein that promotes hair health, though few studies indicate that it can help with hair regrowth. Nevertheless, it’s frequently found in hair products.
• Niacin: Niacin has been shown to help with hair fullness in older research.
• Caffeine: Caffeine is frequently found in hair growth products, as it’s been shown to stimulate hair growth.
• Herbs like saw palmetto, horsetail, and vitamin B3.
• Oils like coconut oil, vitamin E, and peppermint oil.

Its important to note that some ingredients may have negative effects on hair growth. For example, products that are drying to the hair like holding sprays and hard gels are not advisable for long-term use, and ingredients like isopropyl alcohol, formaldehyde, benzene, heavy fragrances, and added colors are not advisable due to the chemicals and negative long-term effects on the hair and skin. Additionally, ingredients called sulfates may be drying to the hair.

Its also worth noting that some hair growth products contain a new ingredient called ProCelinyl, which strengthens hair follicles so they can grow past issues that may be causing hair loss. This ingredient is frequently found in hair growth serums and is often combined with other supporting ingredients like apple extract, caffeine, aloe vera, and saw palmetto extract.