i have some going right now in my slow cooker. you MUST make your own, do not buy from the store.. it just isn't the same trust me.
what you do is get bones, bake them in the oven for 30 minutes
then put water and some apple cider vinegar in your slow cooker and add the bones. let it go for 48 hours.. then remove the bones and add in veggies of your choice, herbs, etc. then let it go another 6 hours and then you are done. if you are fasting you can drink the bone broth by itself and it will help fix your gut health.