Chlorella does not have the toxins which may be present in blue-green algae supplements and spirulina.
What about chlorella sold as a dietary supplement? Harmful, harmless or helpful? There was a report in the journal of veterinary pathology of a golden retriever killed by chlorella and invaded her body by eating its way up to her brain. This is showing the algae creep up her spinal chord, but this is only if you dip an open wound into a scummy pond or something. The chlorella that's in the health-food store is dried and dead.
There have been reports of adverse reactions, for example, here an 11 year old was hospitalized for kidney failure which went away when he stopped chlorella. But this was thought to be an allergic reaction. Similarly there are reports of sun sensitive rashes and asthma triggered by breathing the stuff in, but again, they don't appear to be caused by a toxin like you might find in blue-green algae supplements or spirulina, but much more rare reactions in sensitive individuals. For the vast majority of people, chlorella can be considered helpful. Packed with tons of nutrients, like tiny little dark green leafys. Kinda tastes like you're drinking your lawn though and kale is cheaper.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring watch the above video. This is just an approximation of the audio contributed by veganmontreal.
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