The difference between the red and black shilajit is due to the location where they were sourced.
Every location has a little different taste, smell and mineral profile etc. They are both purified to our very high standard, so it's really about trying them out and seeing which you like better. Also if you have been taking one for a while it might be smart to take the other for a while so your body can get the variety of minerals.
That being said, the red has a more intense taste whereas the black is a bit more mellow.
We are going to try to always provide a black and a red to keep some variety available for returning customers, but the batches will change over time when one runs out.
Not sure how many people realize how different each patch of shilajit actually is, we don't hear a lot of talk about it in the industry. Most companies seem to try and standardize the taste and smell so their product is predictable, but that's just not the truth about how nature works.
We've been working with shilajit for years and have never found any two locations to be the same.