Understanding the interactions, benefits, and safety of combining these two powerful supplements.
We found no documented interaction between Biotin and Soothing fiber formula in the sources below. That isn't proof the combination is right for you: check each one's cautions, and ask your pharmacist if you take medication.
What it is: A B vitamin that helps turn the food you eat into energy.
What the research says: It's widely sold for hair, skin and nails, but there's little evidence for that. A few small studies found harder nails in people with brittle nails.
In Holitro: Biotin 5000mcg (5000 mcg per capsule)
Source: NIH Office of Dietary Supplements: Biotin: Fact Sheet for Consumers (updated January 2021)
What it is: A blend of plants rich in soothing fiber (mucilage): aloe, marshmallow root and slippery elm.
What the research says: A small study found a formula containing slippery elm eased constipation-type IBS symptoms. Small studies suggest aloe taken by mouth may lower blood sugar in diabetes.
In Holitro: Soothing Fiber Formula (350 mg per capsule)
Sources: NIH National Center for Complementary and Integrative Health: Aloe Vera: Usefulness and Safety (updated February 2025); Memorial Sloan Kettering Cancer Center, About Herbs: Slippery Elm (updated June 2022)
Check with your doctor or pharmacist, especially if you take medication.
Check your stack — freeEducational information only, not medical advice. This reflects general ingredient overlap, not a personalized safety review. Always check with your doctor or pharmacist before combining supplements, especially if you take medication, are pregnant or nursing, or manage a health condition. These statements have not been evaluated by the FDA.
Balancing dosages across multiple different bottles is risky, inefficient, and expensive. Soothing Fiber Formula is already lab-dosed and delivered daily in our Gut Pack — one less bottle to manage.
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