The best shampoo is highly individual and depends on hair type, scalp condition, and personal preferences. Consider factors like oiliness, dryness, color-treatment, and sensitivities when choosing a shampoo.

Healthiest shampoos typically prioritize gentle cleansing, natural ingredients, and minimal harsh chemicals like sulfates, parabens, and artificial fragrances. Look for labels indicating sulfate-free, paraben-free, and hypoallergenic formulas.

Historically, people used natural ingredients like soapwort, clay, herbs, and even water alone to cleanse their hair. These methods varied widely depending on available resources and cultural practices.

A gentle, sulfate-free shampoo formulated for your specific hair and scalp type is generally considered the healthiest option. Some individuals also find success with co-washing (using conditioner only) or natural alternatives like diluted apple cider vinegar.