Alcohol consumption can have a significant impact on the absorption of certain medications. According to Drug Patent Watch [1], alcohol can increase the absorption of certain drugs by increasing the blood flow to the stomach and small intestine. This can lead to higher levels of the drug in the bloodstream, potentially increasing the risk of side effects.

However, the effects of alcohol on medication absorption can also be negative. A study published in the National Center for Biotechnology Information [2] found that alcohol can decrease the absorption of certain medications, particularly those that are water-soluble. This is because alcohol can disrupt the protective layer of the stomach and small intestine, reducing the amount of medication that can be absorbed.

In addition to medication absorption, alcohol can also have an impact on nutrient absorption. According to UC San Diego Student Health Services [3], alcohol can interfere with the absorption of certain nutrients, including thiamin, folic acid, and vitamin B12. This can lead to deficiencies and potentially serious health problems.

In conclusion, the impact of alcohol on absorption can vary depending on the medication or nutrient in question. While alcohol can increase the absorption of some drugs, it can also decrease the absorption of others and interfere with nutrient absorption. It is important to talk to a healthcare provider about any potential interactions between alcohol and medications or nutrients.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ALCOHOL
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC543875/
[3] https://studenthealth.ucsd.edu/resources/health-topics/alcohol-drugs/nutrition-endurance.html