Fortunately, these kosher certified products are on the rise now. Health food stores typically carry a large assortment of nutrition supplements, many of which are inherently kosher and need no certification. Products such as kelp, brewers yeast, most olive oils, raw nuts, sea salt, etc. However, such a judgement would be unfair. We can even find people who adhere to the strictest kosher observance at home, and yet feel that eating cooked fish or other natural foods in a health food restaurant is in accordance with Jewish law.
Nothing is further from the truth.
This would include non-kosher fish or oils processed from animals. Of course, these last mentioned are banned by the F.D.A. and will not be found in any stores. Just as the F.D.A. has banned some natural foods from public use because they are harmful, we kosher consumers must be aware of which natural foods to ban from our own diets. There is a need for kosher certification on most health foods, as on other foods. On the other hand, it is easier to determine if something is kosher if there are no hidden ingredients.