New Era Comb I contains ferr phos, kali sulph and mag phos. Mag phos is the tissue salt most often used for muscle spasm and cramping pain, ferr phos is commonly linked with heat and tenderness in the early stage of inflammation, and kali sulph is traditionally used where symptoms move around or linger in soft tissue.
That gives New Era Comb I a clear muscle-comfort use. It is usually chosen when discomfort is sore, tight or sensitive in the muscles, rather than focused in the joints alone. Biotin is also included as an added nutrient for normal energy metabolism and healthy skin and mucous membranes.
The pairing of ferr phos and mag phos is the most useful thing to notice before buying. One is traditionally linked with inflamed discomfort, the other with spasmodic pain, so together they help explain why this blend is used for fibrositis and muscular aches.