Any process that activates or increases the frequency, rate or extent of the cyclical phases of growth (anagen), regression (catagen), quiescence (telogen), and shedding (exogen) in the life of a hair. [ GOC:go_curators http://www.ncbi.nlm.nih.gov/pubmed/12230507 ]
Synonyms: upregulation of hair cycle up-regulation of hair cycle up regulation of hair cycle