A method of producing a soy protein product having a soy protein content of at least 60 wt% (N x 6.25) on a dry weight basis, which comprises: (a) extracting a soy protein source with an aqueous calcium salt solution at a pH of 1.5 to 5 to cause solubilization of soy protein from the soy protein source arid to form an aqueous soy protein solution, (b) at least partially separating the aqueous soy protein solution from residual soy protein source, (c) concentrating the aqueous soy protein solution while maintaining the ionic strength thereof substantially constant to produce a concentrated soy protein solution having a protein concentration of 50 to 300 g/L and the concentrated soy protein solution is optionally diafiltered, (d) diluting the concentrated and optionally diafiltered soy protein solution to form a precipitate, and either (e)(i) separating the precipitate from the supernatant thereto, and (f)(i) drying the separated precipitate to provide the soy protein product or solubilizing the precipitate in water at low pH to form a soy protein solution, which is optionally dried to provide the soy protein product, or (e)(ii) re-solubilizing the precipitate in the diluting water by pH adjustment to form a soy protein solution, and (f)(ii) optionally drying the soy protein solution to form the soy protein product. (a) extracting a soy protein source with an aqueous calcium salt solution at a pH of 1.5 to 5 to cause solubilization of soy protein from the soy protein source arid to form an aqueous soy protein solution, (b) at least partially separating the aqueous soy protein solution from residual soy protein source, (c) concentrating the aqueous soy protein solution while maintaining the ionic strength thereof substantially constant to produce a concentrated soy protein solution having a protein concentration of 50 to 300 g/L and the concentrated soy protein solution is optionally diafiltered, (d) diluting the concentrated and optionally diafiltered soy protein solution to form a precipitate, and either (e)(i) separating the precipitate from the supernatant thereto, and (f)(i) drying the separated precipitate to provide the soy protein product or solubilizing the precipitate in water at low pH to form a soy protein solution, which is optionally dried to provide the soy protein product, or (e)(ii) re-solubilizing the precipitate in the diluting water by pH adjustment to form a soy protein solution, and (f)(ii) optionally drying the soy protein solution to form the soy protein product. (e)(i) separating the precipitate from the supernatant thereto, and (f)(i) drying the separated precipitate to provide the soy protein product or solubilizing the precipitate in water at low pH to form a soy protein solution, which is optionally dried to provide the soy protein product, or (f)(i) drying the separated precipitate to provide the soy protein product or solubilizing the precipitate in water at low pH to form a soy protein solution, which is optionally dried to provide the soy protein product, or (e)(ii) re-solubilizing the precipitate in the diluting water by pH adjustment to form a soy protein solution, and (f)(ii) optionally drying the soy protein solution to form the soy protein product. (f)(ii) optionally drying the soy protein solution to form the soy protein product.