Three peptides, three different cycle lengths, one goal: stop getting sick. Greenfield pairs TB-500 (3 months on, 3 off) with Thymalin (3-10 day bursts every 6-12 months) and LL-37 (4-6 week antimicrobial cycles). Each targets a different layer of immune defense. Warning on LL-37: Herxheimer reactions are common in the first two weeks if you have SIBO or gut dysbiosis.