causal
Analysis v1
Strong Support
Many blue-green algae supplements claim to give you vitamin B12, but they actually contain a fake version that your body can’t use—so if you’re vegan and rely on these for B12, you might not be getting the real thing.
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Evidence from Studies
Supporting (1)
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Community contributions welcome
1
Vitamin B12 Sources and Bioavailability
Narrative Review
2007 NovThe study says the blue-green algae in supplements don’t give your body real vitamin B12—they give a fake version that doesn’t work. So they’re not a good choice for vegans who need B12.
Contradicting (0)
0
Community contributions welcome
No contradicting evidence found
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.