Yes, low carb, even Keto, can constipate even those of us who usually had the total opposite reaction from food. Don't forget to factor in the fact you are probably eating less and your body is using more of the nutrients instead of wasting them. I too add some extra magnesium 1,000 mg along with my regular daily vitamins when having difficulty. Important to take a good multivitamin and other supplements when on Keto. You are like a diesel engine now instead of a gasoline engine. Also, don't be afraid to use a glycerin suppository if you feel impacted. Just sayin' it's necessary sometimes. Good luck!