New Era Comb S contains kali mur, nat phos and nat sulph. Nat phos is the tissue salt most commonly linked with acidity and sour digestion, nat sulph is traditionally used when digestion is heavy, bilious or unsettled after rich foods, and kali mur is often included where mucus, nausea or a coated tongue seems to go with the upset.
That makes New Era Comb S a digestive product with a slightly different angle from Comb C or Comb E. It is usually chosen when stomach upset comes with nausea, queasiness, biliousness or a sick headache rather than mainly cramp and wind. Biotin is also included as an added nutrient.
Nat phos and nat sulph are the two ingredients worth noticing most before buying. They are often paired in tissue salt practice when the stomach is sour, unsettled or overloaded, especially after food that has not agreed with you.