It's a pity no one on the team has any experience in a relevant field, and the "Is it safe?" answer is absurd. You could say the same thing to deem cigarettes safe.
YM dietitian. A dietitian is someone with the relevant educational background, at least in the US. (The title of "nutritionist", in contrast, has no legal requirements, so they are perfectly free to call themselves nutritionists if they want to.)
More than a nutritionist, they probably need a ten year double-blind study. "We tried it on ourselves for a few months" isn't long enough for some deficiencies to present themselves, lacks a control, and both the investigators and the test subjects are aware of what they're taking in.
