Everyone always wonders why Sodium is used in shampoos and conditioners. People have written many articles and blogs on sodium being bad for you. That is correct if you are only using sodium and nothing else, but of course there are always other ingredients within the product to counteract and help balance out the effects for a healthier and non-toxic formula.
Sodium Chloride is a natural salt used in shampoos and conditioners to increase the consistency (thickness) of the shampoo. It helps rinse off the shampoo and conditioner with ease and softens the water you use to wash your hair. Excess amounts of sodium chloride may dry your hair of natural oils which is why there are conditioning agents to counteract the effect and hydrate your hair.
Sodium Bicarbonate, basically baking soda mixed with water, is used to cleanse and clarify the hair. It is in many dry shampoo products in order to remove excess sebum, the natural hair oil secreted from the scalp in order to keep your skin and hair hydrated.
Sodium Laureth Sulphate (SLS) is derived from coconut oil and is considered safe on skin and hair. Sodium Laureth Sulphate is tough and aids in getting rid of dirt and impurities from your hair without any side effects. This is also why sodium is mostly used in shampoos and conditioners.
Of course if any of these are used excessively or you do not follow the directions on the products, it definitely will not be good for you. Just make sure to follow the instructions and the amount of products you should be using on a daily basis. Just because sodium "known" to be bad for your hair, it does not mean every version of sodium is bad. You just have to know what other ingredients are used to counteract the bad to neutralize it.