The concept of producing different products from chlorella for the benefits of health demands efficient utilization of all the components. The high-value antioxidants such as carotenoids, xanthophylls and unsaturated fatty acids from chlorella have beneficial effects for humans and animals. Even chlorella vulgaris can be used as a fish feed for balanced and increased amount of fish production. The availability of vitamin B12 also increases the importance of chlorella as a food supplement for vegans. The biologically active vitamin B12 present in chlorella products is suitable as a natural B12 source for humans. Chlorella contains pigments like chlorophyll, carotenoids, lutein, astaxanthin, zeaxanthin, canthaxanthin, violaxanthin and antheraxanthin which even play a vital role for producing medicines for cancer treatment. This is to note that this book gives an overview about the different health benefits of chlorella starting from its morphological studies.