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D3, 1 alpha,25 dihydroxyvitamin
[d_ˈiː θ_ɹ_ˈiː], [dˈiː θɹˈiː], [dˈiː θɹˈiː] [w_ˈɒ_n ˈa_l_f_ə t_w_ˈɛ_n_t_ɪ_f_ˈaɪ_v d_aɪ_h_ˈaɪ_d_ɹ_ə_k_s_ˌɪ_v_ɪ_t_ˌa_m_ɪ_n] [wˈɒn ˈalfə twˈɛntɪfˈa͡ɪv da͡ɪhˈa͡ɪdɹəksˌɪvɪtˌamɪn] [wˈɒn ˈalfə twˈɛntɪfˈaɪv daɪhˈaɪdɹəksˌɪvɪtˌamɪn]
Definitions of D3, 1 alpha,25 Dihydroxyvitamin
The physiologically active form of vitamin D. It is formed primarily in the kidney by enzymatic hydroxylation of 25- hydroxycholecalciferol ( CALCIFEDIOL). Its production is stimulated by low blood calcium levels and parathyroid hormone. Calcitriol increases intestinal absorption of calcium and phosphorus, and in concert with parathyroid hormone increases bone resorption.