Each blood type has different responses to occasional stress and therefore has different needs when it comes to bringing their bodies back into balance. Catechol. Type O and AB benefit from Catechol’s ability to balance healthy neurotransmitter levels. Cortiguard. Type A and B are helped by Cortiguard which promotes healthy cortisol levels. Tranquility Base. Our popular Tranquility Base is an all natural blend of calming herbs that are right for all types - perfect when you have difficulty falling asleep on your own. Dr. Peter D'Adamo offers a full line of formulas specific to Occasional Stress.