Actually the seeds or the cure was not sent down for Muslim, but all humankind. Allah is an Arabic word for God, so the Christian God, Jew God and Catholic God sent the seeds to Prophet Mohammad to share with the human race.
Anyone can be cured if taken correctly, has faith and follows the diet prescribed. Not only was the seeds given, but so was how to eat, live and sleep.
As to why we got the cure first? Allah knows best.