The next level of superfood is to add freshwater algae and other green powders to your daily juice or smoothie. Spirulina is the darkest and most pungent flavour of the powders. Chlorella is lighter in colour and flavour so may be more accessible to newcomers. Both are complete proteins, high in iron for boosting blood quality for freediving and B vitamins. They're also grown at minimal cost to the environment and local communities so plus points all round. In the same category, and often mixed together with algae powders, are wheat and barley grass.