What's really in your shampoo and why your scalp is paying the price
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The scalp absorbs what you put on it
Your scalp is skin, and skin absorbs. What you apply to your scalp doesn't just sit on the surface, it interacts with the skin barrier, the microbiome and the follicle environment beneath it.
Most shampoo ingredients were designed to clean efficiently and cost effectively. They were not designed with scalp health, hormonal balance or follicle nourishment in mind. The ingredients in a conventional shampoo can actively work against the scalp environment you're trying to support.
The chemicals most worth knowing about
| Ingredient | What it is | Why to avoid it |
|---|---|---|
| Sulphates (SLS, SLES) | Cleansing agents that strip oil and dirt | Strip the scalp's natural oils alongside dirt, disrupting the lipid barrier and triggering dryness, reactivity and overproduction |
| Parabens (methylparaben, propylparaben) | Preservatives that extend shelf life | Endocrine disruptors that mimic estrogen in the body, particularly problematic during hormonal transitions |
| Silicones (dimethicone, anything ending in -cone) | Coating agents that create instant smoothness | Build up over time, blocking follicles and preventing beneficial ingredients from absorbing into the scalp |
| Synthetic fragrance / parfum | Catch-all term for hundreds of undisclosed compounds | Can contain phthalates and known allergens, a common trigger for scalp inflammation and sensitivity |
| Formaldehyde releasing preservatives (DMDM hydantoin) | Slow release preservatives | Release formaldehyde over time, a known carcinogen and scalp sensitiser linked to hair loss |
| Polyethylene glycols (PEGs) | Thickeners and penetration enhancers | May be contaminated during manufacturing and can enhance absorption of other problematic ingredients |
What chlorine in your shower water adds to the problem
Even with a clean shampoo, the water itself can undermine scalp health. Chlorine strips the scalp's lipid barrier and disrupts the microbiome. Hard water minerals build up on the scalp and block follicles over time.
A shower filter that reduces chlorine and mineral content is one of the simplest and most overlooked upgrades for scalp health. The improvement in scalp comfort and hair texture after switching is often noticeable within two to three weeks.
A quick way to audit what's already in your bathroom
Download a product ingredient scanning app. Several are available that rate personal care products against known harmful or disruptive ingredients. Scan what's already in your shower. The results are often surprising.
Why this matters more during hormonal transitions
For anyone navigating postpartum recovery, perimenopause or any period of hormonal disruption, the scalp environment is already under pressure. Adding daily exposure to endocrine disrupting chemicals through your shampoo adds to a hormonal load the body is already working hard to manage.
Sunday Drop formulates without sulphates, parabens, synthetic fragrance, silicones or hormone disrupting ingredients. We are a brand built specifically for hair health while respecting our hormone health at the same time.
Our bodies go through enough during a hormonal shift. The last thing your hair needs is ingredients working against what's already trying to rebalance.
Your ritual starts at sundaydrop.com.au