I've done this 3 times and never had nausea. Maybe it was something you ate earlier in the day? Btw, another poster said the CoC10 should be in a gellcap since it needs oil to be assimilated to the greatest amount. If you get it in regular capsules rather than gellcaps with oil, you could try following it with a tablespoon of olive oil to aid in assimilation. Following or mixing lemon juice or orange juice will help cut the taste.