New Era Comb F contains kali phos, mag phos, nat mur and silica. Kali phos is traditionally used when headaches seem tied to stress, mental overwork or nervous tiredness, mag phos is commonly chosen for spasm and tightness, nat mur is often linked with headaches that come with dryness, sinus pressure or sensitivity to light, and silica is included as general tissue support.
Together, those ingredients make New Era Comb F more suited to nervous or tension-linked headaches than to a random everyday headache. It is usually chosen when the pain comes with strain, fatigue or a washed-out state afterwards. Biotin is also included and supports normal nervous system function.
Mag phos and kali phos are the pairing that stands out most here. They are often used together in tissue salt practice where the head seems tight, overworked or reactive. Nat mur then adds a sinus and fluid-balance angle, which can matter when pressure sits around the forehead or temples.