Supplements are simple to take and offer immediate psychological satisfaction from the expectation of benefit, whereas dietary change requires time and adjustments to daily structure.

Absorption and interactions can differ between nutrients taken in food and in supplement form, and cases of problems from excessive intake of particular compounds have been reported.

Where medication is being taken, checking for interactions with supplements is advised, with compounds affecting blood clotting, blood pressure and blood sugar flagged for particular care.

As the population ages, more people take multiple medicines and supplements at once. Keeping a list and sharing it with clinicians is offered as a practical step.

In ethnic Chinese households, Korean and Chinese health practices are sometimes applied together, and checking ingredients matters when herbal preparations and supplements are combined.

A survey shows a tendency; it does not indicate what is optimal for an individual, which is a matter for personal consultation.