Soylent, the Silicon Valley meal replacement company, has pulled its flagship powdered food product after customers continue to report violent stomach reactions to the product.

In early October, Soylent recalled its snack bars, the company's first foray into solid food, after customers detailed experiences of intense vomiting and diarrhea after consuming the bar. Only a small subset of Soylent customers are getting sick after ingesting a specific version, formula 1.6, of the powder and bars. (Soylent has consistently released new formulations of all its products since founding in 2013.)

After weeks of what Soylent calls an "exhaustive" investigation into its products and suppliers, the company's testing has come back negative for "food pathogens, toxins or outside contamination," Soylent writes on its website. The company is now looking at the ingredients to determine if some people are intolerant to one or more of the many ingredients in the powder and bar. Soylent would not name any of the suspected ingredients, but some contents in both products include Isomaltulose,
Maltodextrin, Canola Oil, Isomaltooligosaccharide, Soy Protein Isolate and other ingredients.

"Fitting with our desire to err on the side of caution, we are reformulating Bar and Powder 1.6 to remove the likely ingredients," Soylent writes in its announcement. "Turnaround should be fairly quick. We expect both will available in early Q1 2017, if not before. We will resume shipping when the reformulation is complete."

Soylent has raised $22.3 million in funding from the likes of Andreessen Horowitz, Lerer Ventures and Index Ventures since founding in 2013. The food supplement drink is popular with engineers and programmers, as Soylent promises all the vitamins, lipids, proteins and minerals in the convenience of a shake. But, the company is no stranger to food and health issues, from reports of sickness to reports of rats and mold in its early manufacturing facilities

For now, customers can still drink its caffeinated drink and other formulations of its powder.

"We are going to continue to look into this further and share our findings with the FDA so that they can do their own evaluation," Soylent writes on its website.