Metformin is a very inexpensive drug that has been around for quite awhile. If I had IPF, I would have no qualms about taking it.
Nature Communications
Published: 05 July 2019
Metformin induces lipogenic differentiation in myofibroblasts to reverse lung fibrosis
https://www.nature.com/articles/s41467-019-10839-0?elqTrackId=fba53c6e426944d78e8fa4a94b2e86ec&elq=7ac1d3e3840a45b99ff3c314981536ae&elqaid=25522&elqat=1&elqCampaignId=10612
Nature Communications
Published: 05 July 2019
Metformin induces lipogenic differentiation in myofibroblasts to reverse lung fibrosis
https://www.nature.com/articles/s41467-019-10839-0?elqTrackId=fba53c6e426944d78e8fa4a94b2e86ec&elq=7ac1d3e3840a45b99ff3c314981536ae&elqaid=25522&elqat=1&elqCampaignId=10612