https://pubmed.ncbi.nlm.nih.gov/17474862/ (Paywalled, abstract only)
https://zero.sci-hub.se/3428/d8f5b3d4ccd98f680daab1f55150cdc1/kwak2006.pdf (full document)
EDIT:
The extract mentioned is from the following species:
https://en.m.wikipedia.org/wiki/Pinus_densiflora
[known as: Japanese red pine, the Japanese pine, or Korean red pine]
EDIT 2:
The bark of the same species contains neuroprotective compounds:
https://www.jmb.or.kr/journal/view.html?doi=10.4014/jmb.1801.01053
“Taken together, these results suggest that [Korean red pine bark extract] and its constituent antioxidative phenolics are potent neuroprotective agents that can maintain cell viability under oxidative stress and inhibit cholinesterase activity.”
I have a heart condition (atrial fillibration) and can't take these as it could cause all sorts of complications, its the same with HCQ.
If you have to take Digoxin then please leave Pine Needle tea and HCQ alone.