In a context of quest for economic emergence with growth and social development objectives, investment in research, development and the launch of new products is of great importance. As the risk of failure in the launch of new products is still current, our research is an extension of the work focused on the key success factors of new products. The main objective of this article is to analyze the impact of word of mouth on the intention to buy new bottles of mineral water by Cameroonian consumers while checking the possible moderation of this link by the gender and age. Data collected from a sample of 683 Cameroonian consumers allowed us to test the three hypotheses formulated. The results reveal (1) that there is a positive and significant effect of word of mouth on the intention to purchase new bottles of mineral water (10 liters, 0.33 liters and 0.30 liters); that (2) men are more sensitive to word of mouth than women and curiously that (3) the group of consumers over the age of 30 tends to express a greater intention to purchase new bottles of mineral water as a result of word-of-mouth exposure only the 0 to 30 age group.