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What is the proper method for administering Humulin R insulin via injection?

You should inject Humulin R insulin into the fatty part under your skin about 30 minutes before you eat a meal. You can inject it in different places like your belly, the back of your upper arms, or the tops and outsides of your thighs. Don't use the same spot for two injections in a row to avoid skin problems. Humulin R insulin works quickly, so make sure to eat after taking it to prevent low blood sugar