Anacleto del Rosario, a leading pharmacist and chemist during the Spanish period who made a lot of analyses of mineral springs and medicinal waters in the country, also examined the chemical components of “Agua de Boac” and considered it comparable to other well-known curatives like “Agua de Carabana” and “Agua de Vichy” from Europe.
During the American occupation of the island, soldiers of the 13th U.S. Infantry stricken with dysentery were transported to Buenavista simply due to the fact that “there is a large effervescing sulphur spring which has quite a traditional reputation among the natives of the community”.

In the Philadelphia Medical Journal published in 1903 Dr. T.H. Weisenburg, who served as a surgeon in the U.S. Army during the pacification campaign in Marinduque wrote: “It is said that drinking of this water would stop diarrhea of any kind. It is possible even now to buy water from this spring in any drugstore in Manila”. Literature on the treatment of tropical dysentery with sulphur was very limited during that period.

Many locals still turn to Malbog sulphur spring for skin ailments and for the therapeutic benefits derived from swimming in this hot spring. Currently, the municipal government of Buenavista under the leadership of Mayor Russel S. Madrigal is eyeing the rehabilitation and development of the Malbog Sulphuric Hot Spring into a new resort with amenities for health buffs.
Recently, a team from the Department of Tourism (DOT), Tourism Infrastructure and Enterprize Zone Authority (TIEZA), Department of Environment and Natural Resources (DENR), MIMAROPA Regional Office, together with Congressman Allan Velasco of the Lone District of Marinduque conducted an inspection of the site as shown in these photos. Malbog is viewed as an important part of Marinduque’s site inventory for tourism development.