More than 100 psoriasis sufferers over the age of 18 are wanted for a vitamin D trial in Auckland.
Psoriasis is a chronic, non-contagious inflammatory skin disease, affecting around one in 50 New Zealand adults.
Massey University PhD student Michelle Ingram says traditional treatments include creams, topical lotions, pills or injections, which can be expensive and inconvenient.
She's excited by the potential of an alternative low-cost treatment of taking vitamin D supplements.
Michelle Ingram says participants don't need to have a doctor's referral, and will be screened by dermatologist before being accepted.
People can register their interest by going to psoriasis.massey.ac.nz.