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Is sea water good or bad for your hair?

By July 14, 2019January 18th, 2021Hair health

Swimming in the ocean provides a number of benefits to your physical and mental wellbeing. However for hair, the activity can be a double edged sword as it highly depends on your hair type and current condition of your strands. Cosmetic manufacturers sell us beach-y waves in a bottled form during wintertime, but with summer holidays upon us – we can get the real deal out on the actual beach. The impact of salt in sea water is not black and white: while there are some benefits from the exposure to sea water, in order to protect your hair from dryness and brittleness, there are a few precautions you can take.

How the beachy waves get created

Sea water, aside from the actual water, contains Chloride, Sodium, Magnesium, Sulfate, Calcium and other elements. While our hair is hair is comprised of keratinous protein, our strands have crosslinks in between those protein. Crosslinks, or three-dimensional binds, are a formation of covalent bonds between adjacent amino acids. In turn, salt – or sodium chloride and magnesium sulphate – both present in seawater, create extra crosslinks within your hair curving your hair strand and thus, putting the “waves” in the beach waves.

Con: Dehydration of hair

The salt is hygroscopic: it attracts more water to your hair forming more salt crystals, but this process wicks away the moisture from the inside of your hair strand – making it dry and brittle, a process that also reduce the crosslinks between cysteine bonds making it more fragile.

Con: Extreme dryness for chemically treated hair

If you are using dye or bleach, or if your hair structure has been chemically altered – the sea water can worsen its condition. Chemical treatment already  already stripped your hair from the nutrients and artifically changed the crosslinks within your hair strands. The hygroscopic properties of salt water already takes away moisture even from healthy hair, but it worsens it further for chemically altered strands.

Pro: Extra body and fullness of hair

On the plus side, salt water crystals add the “body” to your hair. This can be a good thing, if you want to increase your hair volume. Beware, as this extra salt also makes them dry and lifts up the hair cuticle, which makes it susceptible to further moisture loss.

Pro: Nutrients absorbed by your scalp

Sea water contains nutrients that your body needs. For example, magnesium has been known to strengthen your neurosystem and has a calming effect on your body. Magnesium is also absorbed well through your skin, making an ocean dip not only enjoyable but also – healthy for your nerves. Less stress has been linked to better hair growth, so the calming effect of magnesium is a big plus.

Pro: Exfoliation and blood flow stimulant

The salt water crystals can serve as an excellent exfoliator for your scalp to remove product build up from hair roots, as well as to stimulate bloodflow if you are to massage your scalp with the salt scrub. So massaging your scalp after the hair dries up – is a good idea, as there are numerous benefits in stimulating blood flow in scalp.

Pro: Antifungal properties

Salt can help with the dandruff originated from a fungus, as salt water has anti-fungal properties. Those antifungal properties occur by fungi having to spend more energy in achieving osmosis (or osmoregulation) with salt water vs fresh water, instead of spending that energy on its own growth.

Pro: Natural shampoo and grease remover

If you have greasy scalp, then sea water can help you to strip heavy oils and extra sebum acting as a dry shampoo. It absorbs excess oils present on your tresses close to its root.


The answer is therefore, two fold. To prevent your hair from drying as a result of exposure to the sea and ocean water – consider using natural hair oil or biodegradable and ecologically-friendly leave-in conditioner prior to walking onto the beach. This will coat your hair strands and prevent the salt wicking away the moisture. To help you choose the best natural oil to minimise damage from salt water and maximise nourishment for your hair texture, your age and your living environment, take a quick quiz:

Natural oils, as well as biodegradable and environmentally-friendly products ensure that our sealife and oceans stay protected from obscure chemicals, but they are also a lot less likely to negatively react with the salt water. Good for nature AND good for you.

What can you do?

As a post-beach DIY treatment you can massage your scalp with your fingers to use small salt crystals as natural exfoliator to your scalp, following up with a homemade honey and buttermilk mask, or a egg + avocado + olive oil mask.


Sodium Chloride Inhibits the Growth and Infective Capacity of the Amphibian Chytrid Fungus and Increases Host Survival Rates (1)

Composition of Sea Water (2)

Thirst, The Scientific American (3)

Join the discussion 6 Comments

  • Susan says:

    Do not leave a conditioner in your hair prior to going into the ocean!!!!

    This is a terrible idea as you have no idea what the chemicals in the products people choose to use will react with and possibly cause damage to coral and microscopic sea life. You really should re write this and suggest people to only condition after the beach.

    • thehairfuel says:

      Thanks for your reply Susan! Very, very good point. It is important to use environmentally-friendly and biodegradable products in your hair care on- or off-beach. It’s not only good for nature but also – better for your hair. It doesn’t really matter where people condition really – since even after returning from the beach – water from your shower eventually ends up in the ocean. So – environmentally-friendly, nature-based products is the only way to go!

  • Brooke Hayward says:

    Perfect timing for this post! Appreciating the time and effort you put into your website and in-depth information you offer. You’ve really covered up almost all the possible info that every female should follow. Worth sharing! Please do continue sharing updates! Thanks!

  • InOnIt says:

    A mixture of almond and coconut oil for very much hairloss problem – Does it stop hair effectively?

    • thehairfuel says:

      Not that we know of. Coconut oil and almond oils are good for soothing the scalp – but don’t have known effects for stimulating hair growth. However both are good when treating your hair lenghts.

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