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A miracle hair booster from ‘The Hair Doctor’, Philip Kingsley, PK4 Dietary Supplements provide the nutrients that are essential to hair growth. Particularly good for those who don’t get enough protein in their diet, this soy protein supplement is fortified with amino acids – the building blocks of keratin, the protein that hair is made of. Hair has the second fastest cell turnover in the body, so it’s nutritional needs are great; however, as it's is considered ‘non-essential’, nutrients go to main organs first, so it’s particularly useful to take hair supplements. After three months, this advanced formulation will have a visible effect on your hair – the results are noticeable more quickly in nails – leaving it longer, stronger and enviably healthy.