Many fruits contain significantly more vitamin C than oranges. For the most bang for your buck, squeeze some guava juice.
Dubbed ‘the sunshine vitamin,’ vitamin D is naturally produced by the body in small amounts, but deficiencies are commonplace.
Beef is high in iron. But it’s not the only protein that can boost iron levels. Seafood, and in particular, shellfish, is a surprising source.
For vegetarians, spinach is another excellent iron source, although it can be tough to eat 200 calories of just spinach.