Which of the following should not be recommended to clients in terms of supplements?

Recommending clients to avoid controversial supplements is grounded in the principle of safety and efficacy. Controversial supplements may involve ingredients that lack sufficient scientific backing or could have questionable effects on health. They could also pose risks such as interactions with medications or adverse side effects, particularly if they are derived from unvalidated sources or hype-driven marketing rather than robust clinical evidence.

On the other hand, fruits and vegetables are widely endorsed for their nutritional benefits, including vitamins, minerals, and antioxidants that support overall health. Moderate doses of vitamins are also typically beneficial, as they can help fill gaps in dietary intake without exceeding recommended levels that might lead to toxicity. Similarly, natural protein sources, such as lean meats, legumes, and nuts, provide essential amino acids needed for bodily functions and are generally safe and support a healthy diet. Thus, the emphasis on avoiding controversial supplements prioritizes client safety and informed decision-making.