Given what you told us about synthetic vitamins not being equivalent in efficacy to synthetic versions, what are the implications with regard to synthetic pharmaceuticals used instead of natural substances from nutraceuticals, to treat disease symptoms?

The same object lesson applies here. Things from nature have special properties not discernible by science or understandable, even based on existing scientific knowledge. While it would seem to the human mind that chemistry is chemistry and a chemical structure is a chemical structure, that is a materialistic perspective only, when in fact, everything in nature is Godly and imbued with divine consciousness. Whereas, synthetic substances across the board will lack the extra dimension that is, in effect, a purposefulness as a characteristic in addition to the chemical properties of the natural substances. Their consciousness will promote a healthy well-being and good outcome in the physical body when ingested by humans or animals. So this is an unknown reason why pharmaceutical drugs have, often times, meager benefits in preventing symptoms of illness and will be less persistent in the body and possibly have a significant downside from side effects.