According to the Enchiridion Indulgentiarum: Normae et Concessiones 15. “An act of spiritual communion, expressed in any devout formula whatsoever, is endowed with a partial indulgence.
Act of Spiritual Communion:
My Jesus, I believe that you are present in the most Blessed Sacrament. I love You above all things and I desire to receive You into my soul. Since I cannot now receive You sacramentally, come at least spiritually into my heart. I embrace You as if You were already there, and unite myself wholly to You. Never permit me to be separated from You. Amen.