Why Solid Shampoo Bars Are Better for Your Hair (and the Planet)

When I first started making the Hemp & Cherry Solid Shampoo Bar, I was solving a personal problem: I wanted my hair to feel clean without the build-up that comes from most bottled shampoos, and I didn't want to keep throwing out plastic every two weeks.

A few months later, that bar had replaced my entire shampoo routine. Here's what I learned.

What's actually in a liquid shampoo?

Most liquid shampoos are 60–80% water. That water needs to be preserved (preservatives), the formula needs a pH adjuster, an emulsifier, fragrance carriers... you end up with a long ingredient list where the effective cleansing agents are maybe 5–10% of the bottle.

A solid shampoo bar has none of that filler. It's concentrated. A single 60-gram bar like ours replaces approximately 2–3 bottles of liquid shampoo.

The zero-waste argument

The packaging conversation is the obvious one: no plastic bottle. But the hidden benefit is shipping weight. A liquid shampoo bottle is mostly water being shipped across the country. A solid bar is dense, lightweight, and ships in a fraction of the space.

At scale, this matters. For you, right now, it just means less recycling and one fewer thing to worry about.

Why hemp and cherry?

Hemp seed oil is rich in omega fatty acids — 3, 6, and 9 — that closely mimic your scalp's natural sebum. It moisturizes without coating the hair shaft, which means softness without heaviness.

Cherry kernel oil does something different: it adds a silky slip that makes detangling easier, and it's lightweight enough not to weigh fine hair down.

Together, they balance each other. The bar works for most hair types — fine, thick, curly, straight — because neither oil is heavy-handed.

The transition period

Here's the part most brands gloss over: there's a transition period when you switch from liquid to solid shampoo.

Your scalp has been conditioned by liquid shampoo's surfactants to over-produce oil (because they strip more than necessary). When you switch, it takes 1–3 weeks for your scalp to recalibrate. During this time, your hair might feel different — sometimes more waxy, sometimes squeaky clean.

This is normal. It's temporary. Most people find that after the transition, they need to wash their hair less frequently, because the scalp isn't overcompensating anymore.

How to use a shampoo bar

The technique matters. Don't rub the bar directly on your hair — that causes tangling. Instead:

1. Wet your hair thoroughly.
2. Lather the bar between your palms until you have a good foam.
3. Apply the foam to your scalp and roots.
4. Massage in, then let the lather run through the lengths.
5. Rinse well — longer than you think.

Between uses, let the bar dry in a well-ventilated spot. A bamboo soap dish works. A puddle of water does not.

Is it worth it?

Yes — but not because it's the "eco" choice (though it is). It's worth it because the formula is genuinely better: concentrated, effective, without the water and synthetic thickeners that liquid shampoos require.

Michael's Mum shampoo bar was made for everyday hair. Not for an ideal version of your hair. For the hair that gets rained on, exercised in, and slept on. That's what it was designed to handle.