A: Intervention Group - Standard of Care Concurrent Chemoradiotherapy (Chemotherapy + Radiation) with nutritional supplement. Impact® Advanced Recovery: Three times daily for the 5 days just prior to the start of each cycle of chemotherapy. Participants will undergo pre- and post-treatment assessments.

B: Control Group - Standard of Care Concurrent Chemoradiotherapy (Chemotherapy + Radiation) with nutritional supplement. Boost® High Protein: Identical schedule of a supplement with similar calorie and protein content, Boost® High Protein. Participants will undergo pre- and post-treatment assessments.

The intervention drink Impact® will be ingested every two weeks since usually chemotherapy is delivered concurrently with radiation therapy in 2 week cycles. For patients who are placed on weekly or every 4 weeks chemotherapy dosing schedules, the treatment and control supplements will still be given every two weeks.

Overall toxicity from therapy as assessed by NCI Common Toxicity Criteria for Adverse Events (CTCAE) v. 5.0 that directly correlates with toxicity from concurrent chemoradiotherapy. Based on another randomized trial using pretreatment immunonutrition, investigators want to see if this nutritional intervention will likely decrease overall chemoradiotherapy related toxicity. All toxicity and adverse events (CTCAE v.5.0) will be assessed weekly and attributed by the treating radiation oncologist and entered into the clinical trials management database OnCore for later statistical analysis. Differences in toxicity events at the end of the study in participants receiving Impact® and those receiving Boost® will be compared using two-sample t-test.

Measurement of the marked change of IL-6 that directly correlates with toxicity from concurrent chemoradiotherapy. Multiplex immunoassay will be used to determine the plasma levels of IL-6 in pg/ml as a continuous variable. Two-sample t-test for change in IL-6 at the last visit from the baseline will be compared between the two arms. Kolmogorove-Smirnov and Jarque-Bera tests will be performed to test for normality assumption on the primary endpoints prior to t-test analysis. If either test indicates a violation of the normality assumption, investigators will use an appropriate rank-based Wilcoxon rank-sum test instead of t-test.

Overall survival (OS) defined as the length of time interval between the date of cancer treatment completion and the date of death due to any cause. Kaplan-Meier curves will be estimated for each arm. Log-rank test will be performed to examine the effect of Impact® vs. Boost® on measures of OS.