Your blood sugar levels are well-controlled; a fasting level of 90 mg/dL and a postprandial level of 168 mg/dL are within the target range for diabetes management. The combination of Kombiglyze XR with multivitamins, protein powder, and Salmon Omega-3 is generally safe, as there are no known major interactions. However, make sure to check your protein powder label to ensure it contains no added sugars that could impact your glucose levels. Since your current regimen is highly effective, you can safely continue it. Always share your complete supplement list with your doctor to ensure regular monitoring of your kidney and liver function.