Hibiscus and vitamin C

JohnLas

Hello !

Cronometer shows that Hibiscus has not vitamin C.

However, several published studies refer that Hibiscus is a rich source of vitamin C.
- https://pubmed.ncbi.nlm.nih.gov/30131149/
- https://pubmed.ncbi.nlm.nih.gov/30131149/
- https://pubmed.ncbi.nlm.nih.gov/23749748/
- https://pubmed.ncbi.nlm.nih.gov/24175424/
- https://pubmed.ncbi.nlm.nih.gov/16106391/
- https://pubmed.ncbi.nlm.nih.gov/34583174/
- https://pubmed.ncbi.nlm.nih.gov/32354172/
- https://pubmed.ncbi.nlm.nih.gov/33967336/

How can we explain this difference between cronometer and published studies ?

Thank you for your time !