What are some natural ways to boost your immune system?

Aside from the usual advice like making sure to get consistent, healthy sleep, eating foods that are high in vitamins and nutrients, and getting at least a little bit of exercise a day like walking, reducing stress in every way possible definitely helps. Lots of studies confirm that a bunch of stress stress weakens the immune system. Also people who have a good relationship with their friends and family, just ways of feeling supported and laughing etc. helps reduce stress and makes a big difference on the immune system. Always easier said than done though.