L-Arginine is an amino acid. L-Arginine Fortifying Shampoo is also enriched with a Keratin Complex, therefore nurtures hair scalp & roots. It promotes hair growth and strengthens the hair structure. How to use: Massage the shampoo into your scalp, lather through your mid-lengths and ends and let it work its magic for a minute or two before rinsing off. For best results, follow with our matching daily L-Arginine conditioner and once or twice per week with the matching anti-hair loss hair mask. See our other listings. Description: L-Arginine prevents hair loss Keratin Complex strengthens the hair from deep within Repairs damages Improves blood flow to the scalp Fortifying properties strengthen the hair and follicles Rich in Amino Acids