Take, eat. This is My Body which is broken for you, for the remission of sins. Likewise, after supper, He took the cup, saying: Drink of this all of you: this is My Blood of the New Covenant, which is shed for you and for many, for the remission of sins....Your own of Your own, we offer unto You, in behalf of all and for all. -- Divine Liturgy of St. John Chrysostom
From ancient times, the undivided Church as always believed that the bread and wine consecrated in the Divine Liturgy are mystically transformed by the power of the Holy Spirit into the very Body & Blood of Christ our God.
Holy Communion isn't a means to union; it's the fruit of a union already achieved. First, we must believe the same thing. If you aren't an Orthodox Christian, while you cannot receive communion, we invite you to partake of the blessed bread at the end of the service, and then stay for coffee hour. It's a good time to meet one another and get to know some of the parishioners.
Orthodox Christians are invited to approach the Holy Chalice and receive Communion. If you are visiting and Orthodox, refer to Already Orthodox for information on what is expected of you and whom to contact prior to your arrival.