No, insulin does not break a fast.
Having subcutaneous (under the skin) or intravenous (through a vein) insulin does not invalidate a fast, such as during Ramadan. Even administering intravenous glucose to treat hypoglycemia (low blood sugar) does not break the fast. The primary concern during fasting for individuals using insulin is managing blood sugar levels to avoid hyperglycemia (high blood sugar) or hypoglycemia. Careful monitoring and adjustment of insulin dosage are crucial, preferably under medical supervision.
