'Split a specific cell in dataframe into a list of values

I'm trying to get cell values from Excel using pandas. In some cases there are multiple values in one cell.

How can I separate them into different values?

row = str(df_sheet.loc[df_sheet["customer_id"] == customer, "allergies_code"])
customer_allergies = row.values

For 113,115,121 I am getting the output 113115121.

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