Support hair health from the inside out with Philip Kingsley PK4 Soya Protein Boost, a soya-based protein supplement that aims to improve the quality and condition of hair. Developed by the brand\'s expert trichologists to provide extra daily nutritional support to your hair, the protein food supplement is fortified with amino acids (the building blocks of hair) and provides follicles with a concentrated dose of protein to promote healthy hair. Protein is essential for optimum hair growth and quality, making this supplement ideal for those with low protein diets. Suitable for vegans and vegetarians.