1. Oral galactose therapy: After obtaining informed consent and assent FSPF will be obtained at a baseline to determine eligibility. Blood samples for FSPF will be collected in a "red-top" tube (without anti-coagulant), allowed to clot, then spin and separate. The serum will be shipped on ice for FSPF analysis to the laboratory of Virginia Savin, Medical College of Wisconsin, Milwaukee, WI. All other parameters (including weight, height, blood pressure, urinalysis, urine protein: creatinine ratio, serum albumin, creatinine, electrolytes, and glucose) will be collected at the same visit as part of standard of care. Female participants of child bearing age will be given a urine pregnancy test and excluded from the study if pregnant.