This study will be conducted as a remote un-controlled trial to evaluate the tolerability of MHS-1031 and separately the tolerability of the formulated placebo in two similar subject groups with heartburn. Candidates will have heartburn and be taking daily PPIs at up to twice the standard OTC or prescription dosage.~Approximately 400 subjects (men and women of all races and ethnicities) will be randomly enrolled in a 1:1 ratio to receive Product or Placebo (1.4 ml) per day.~Screening phase: 14 days~Product/Placebo phase: 56 days. From Day 1 through Day 28 each subject will continue taking their usual daily PPI. Beginning on Day 29 and through Day 56 subjects will be requested to not take a PPI. Subjects may re-start taking a PPI at any time.~Product Phase: 28 days. All subjects will receive MHS-1031.~Follow-Up Phase: Subjects who complete the Product Phase of the study will enter into a 14-day Follow-up Phase, during which subjects will take neither placebo nor MHS-1031.~For entry into the Screening Phase, subjects must have the following history: Heartburn experienced at least 1 day per week while taking a PPI.~During the study, tolerability will be assessed via on-line validated PRO questionnaires and assessment of adverse events. Tolerability is defined as no overall worsening of heartburn measurement scores after 8 weeks of taking the product or the placebo compared to baseline scores.
Remote un-controlled trial to evaluate the tolerability of MHS-1031 and separately the tolerability of the formulated placebo in subjects with heartburn. Candidates will have heartburn and be taking daily PPIs at up to twice the standard OTC or prescription dosage. Approximately 400 subjects (men and women of all races and ethnicities) will be randomly enrolled in a 1:1 ratio to receive Product or Placebo (1.4 ml) per day.