Usually my go to are red strains that are Thai, Jong Kong, and Hulu. I recently picked up some Red Ketapang which made me profusely vomit. I took about 10 to 12 grams which is what I usually take. I also take my kratom with water after a small meal or snack.
I've taken green maenga da strain in the past which would make me nauseous even with a small dose. Unforunately I have a large quantity of the red ketapang so I don't want to just get rid of it.