natural remedies for health?

i’ve been taking ACV and coconut oil for a while now, but after doing some research on taking ACV internally and the long-term side effects it could cause, I’m a little scared now. what are some tried and true natural remedies I can take internally to help my health without all the nasty long term side effects?
i got the information from
thank you all for your answers. i think i’m going to do what everyone is saying here, and try to eat a more nutritious diet and just take a multivitamin daily. i’ve already been trying to avoid foods with bad ingredients/preservatives, but it’s kind of hard being 17 with no job to buy the foods i want to eat.