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COMMON CHEMICAL INGREDIENTS IN HAIR CARE PRODUCTS

Many ingredients used in conventional products cause scalp irritation, inflammation, itchiness and redness which negatively impacts hair follicle health and the overall hair growth cycle. Furthermore some of the commonly used ingredients in common hair care products interfere with hormone levels, which can exacerbate hair loss. 

Prolonged exposure to chemicals can weaken hair, cause breakage, and lead to irreversible damage to hair follicles. 

Certain chemicals have links to severe illnesses, reproductive issues, and other severe health problems. Toxic chemicals may offer short-term benefits but damage the scalp long-term.

Here are the most common harmful ingredients in Hair Growth products:

 




Sulfates (Sodium Lauryl Sulfate, Sodium Laureth Sulfate)

These harsh detergents strip away natural oils, drying out the scalp leading to irritation. Over time, this can weaken hair and contribute to hair loss. 

Why avoid?

Sulfates can cause scalp irritation, strip hair of natural oils, and weaken the hair follicle, especially for people already experiencing thinning. 

How to spot

Look for “Sodium Lauryl Sulfate” or “Sodium Laureth Sulfate” on the label








Parabens (Methylparaben, Propylparaben)

Commonly used as preservatives, parabens can disrupt hormone functions, which can be harmful to hair growth and overall health. 

Why avoid?

Hormonal imbalance from parabens may affect the hair growth cycle.

How to spot

Look for ingredients ending in “-paraben” (e.g., methylparaben, butylparaben.







Phthalates

Often found in synthetic fragrances, these chemicals are known to disrupt endocrine function and are linked to reproductive health issues. 

Why avoid?

Endocrine disruption can impact hair growth by affecting hormonal balance.

How to spot

Avoid products with vague “fragrance” or “parfum” listings, as they may contain phthalates. 






Formaldehyde and Formaldehyde-Releasing Preservatives (DMDM Hydantoin)

These preservatives can cause skin irritation and long-term exposure has been linked to hair loss.

Why avoid?

Formaldehyde is a known carcinogen and can exacerbate scalp issues. 

How to spot

Look for ingredients like “DMDM Hydantoin” or “Imidazolidinyl urea.”







Silicones (Dimethicone, Cyclopentasiloxane) 

Silicones coat the hair, making it feel smooth initially, but they can build up over time, preventing moisture and nutrients from penetrating the hair shaft.  

Why avoid?

Silicones coat the hair, making it feel smooth initially, but they can build up over time, preventing moisture and nutrients from penetrating the hair shaft.

How to spot

Look for ingredients ending in “-cone” (e.g., dimethicone) or “-siloxane” on product labels.








Propylene Glycol

Often used as a moisturising agent.

Why avoid?

It can irritate the scalp and strip hair of its natural oils.

How to spot

Listed as “propylene glycol” or PEG (polyethylene glycol) on product labels. Side effects: Can cause allergic reactions, scalp irritation, and damage the hair’s natural protective barrier.


DEA/TEA (Diethanolamine, Triethanolamine)

These are used as foaming agents in shampoos and other hair products. 

Side effects: Can cause skin irritation and have been linked to liver and kidney damage with prolonged use.  

Why avoid?

DEA and TEA can react with other ingredients to form nitrosamines, which are known carcinogens.

How to spot

Look for ingredients that include “DEA” or “TEA” in the name, such as cocamide DEA or lauramide DEA.


Synthetic Fragrances

Side effects: Can cause headaches, allergic reactions, respiratory issues, and skin irritation. Some fragrances contain phthalates, which are linked to hormone disruption.

Why avoid?

Synthetic fragrances can contain hundreds of chemicals that manufacturers aren't required to disclose. Many of these are irritants or allergens.

How to spot

Look for the word “fragrance” or “parfum” on the ingredients list.


Petrolatum and Mineral Oil

Side effects: Can cause product buildup, scalp irritation, and prevent hair follicles from functioning properly.  

Why avoid?

Used for moisture retention but can clog pores on the scalp, which inhibits hair growth.  

How to spot

Look for “petrolatum” or “mineral oil” on the label.


Minoxidil

An over-the-counter medication applied directly to the scalp to stimulate hair growth and slow balding. It's available as a liquid or foam. 

 

Some of the most common side effects of using topical hair growth products like minoxidil include: 

1. Scalp irritation or itching - This is the most frequently reported side effect of topical minoxidil. It can usually be managed by reducing application frequency or using a lower concentration.
2. Dryness or flaking of the scalp
3. Skin irritation - Some people may develop redness, rash or swelling, especially if allergic to ingredients like propylene glycol.
4. Changes in hair color or texture
5. Unwanted hair growth in other areas if applied accidentally
6. Temporary increased hair shedding initially
7. Acne breakouts
8. Dizziness or lightheadedness (with excessive use)
9. Chest pain or rapid heartbeat (with excessive use)
10. Difficulty breathing when lying down (with excessive use)



Finasteride

A prescription pill that works by blocking the hormone responsible for male pattern baldness. It's primarily used for men.

 

Side Effect: decrease libido, decreased fertility in men, erectile dysfunction