We asked a personal trainer how he would spend $100 on supplements. Here's what he bought.

Shopping for supplements can be overwhelming.

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• A personal trainer shared his top picks to get the most value from buying $100 worth of supplements.
• Products like creatine, protein powder, and fiber are the most versatile for overall benefits, he said.
• He shared what to look for and what to avoid when in the supplement aisle for the best results.

Personal trainer Ben Foster used to describe himself as a "supplement minimalist."

He'd...