no, you don't need organic seeds specifically for seed cycling to work. the theory behind seed cycling relates to the fibre, healthy fats, lignans and micronutrients naturally present in flax, pumpkin, sesame and sunflower seeds, and these are present in both organic and conventionally grown seeds.
what organic actually changes
choosing organic seeds mainly affects how they were grown, particularly around pesticide use and farming practices, rather than significantly changing their core nutrient content. some people prefer organic for personal, environmental or ethical reasons, which is a valid choice, but it isn't a requirement for seed cycling to be worthwhile.
what's actually worth prioritising
- freshness matters more than organic status, particularly for flaxseed, which can go rancid once ground due to its healthy fat content
- grinding your seeds (rather than eating them whole) makes a bigger practical difference to how well you absorb their nutrients
- proper storage, ideally in an airtight container in the fridge or freezer once ground, helps preserve quality regardless of whether the seeds are organic
if budget is a consideration, and for most people it is, it's entirely reasonable to choose conventionally grown seeds and put the savings towards consistency instead, since eating your seeds regularly matters more for seed cycling than which farming method produced them. organic seeds are a personal preference layered on top of seed cycling, not a prerequisite for it.