causal
Analysis v1
Strong Support
There's a special ingredient called palmitoyl tetrapeptide-20 that some products claim can stop hair from turning gray and even bring back its original color.
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Evidence from Studies
Supporting (1)
1
Community contributions welcome
1
The study says scientists and companies are already using palmitoyl tetrapeptide-20 to help stop and reverse gray hair, which is exactly what the claim says.
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.