Iron supplements are often formulated from inorganic rock or metallic sources and poorly absorbed by the body. They can cause side effects such as stomach ache, heartburn, nausea, vomiting, diarrhea and constipation. Although the iron in algae is non-toxic, some people experience mild reactions in the early stages of dietary changes. Tell that to a world-class athlete. Even sedentary people can have a hard time getting all the nutrients they need from the average diet.
Muscles depend on a vast series of electrochemical interactions.
The adaptive response, or level of functional output, is directly related to the metabolism or energy production within the cells. To make further gains, better metabolism is required. This requires high quality nutrition. Each minute, three hundred million or more cells in our bodies wear out and die. Most of them are immediately replaced by division of the remaining cells.