A good shampoo must have adequate viscosity to facilitate removal from the bottle but must not drip down from the hair during use.
A variety of natural materials is available for use as viscosity builders. We used 10% gelatin solution for this purpose as it shows pseduoplastic behavior
and forms clear solutions.
Citric acid was added to adjust the pH to the desired level.
Lemon juice (1 mL) was also added as natural antioxidant, chelating agent and antidandruff agent to maintain the acidic pH of formulation.
Shampoo was further preserved by the addition of little amount of methyl paraben.
Final formula of the prepared shampoo is presented in Table 1.