These are health information based on customs and superstition

"Unreliable source of information" seems to be the correct approach.

Explanation:

In general, health knowledge based on ignorance and practice is viewed as an inaccurate collection of knowledge. Typically, credible references are mostly from health manuals and physicians. They are not accurate because their scientific community has not been confirmed.The medical data throughout this situation is typically transmitted by word of mouth from era to era. We ought to be responsible when it comes regarding healthcare details whenever it applies to aspects of life including death.

"observation" would be the correct answer