Most important: Biotin and lab test accuracy. This label includes 2,500 mcg of biotin per serving — a very high dose relative to typical dietary intake. The FDA has warned that biotin in dietary supplements can interfere with certain laboratory tests and cause incorrect results, including falsely low results with some troponin assays used to help diagnose heart attacks. If you take this supplement, tell your doctor and lab personnel before any blood test.
Alfalfa — major interaction with warfarin. NIH's consumer drug-interaction database flags alfalfa as a major interaction with warfarin specifically, due to its vitamin K content working against the medication's intended effect. Alfalfa also carries cautions for autoimmune conditions (lupus, rheumatoid arthritis, MS) and hormone-sensitive conditions, given its mild estrogen-like activity.
Saw Palmetto — blood-thinning medication. Documented interaction considerations with anticoagulant and antiplatelet medications. Combined with Alfalfa above, anyone on blood thinners should raise both ingredients with a healthcare provider before starting.
Stinging Nettle — diabetes and blood pressure medication. Research shows blood sugar-lowering and blood pressure-lowering effects that could compound the effects of related medications.
PABA — sulfa antibiotics. A well-established mechanism reduces the effectiveness of sulfonamide (sulfa) antibiotics, since sulfa drugs work by blocking the same pathway PABA feeds into.
Fo-Ti — liver health. Published medical literature has associated Fo-Ti (Polygonum multiflorum) products with case reports of liver injury. This is ingredient-level evidence, not evidence of harm from this specific product, and the individual amount here is not disclosed.
Horsetail — long-term, high-dose use. Contains an enzyme (thiaminase) that can deplete vitamin B1 with prolonged heavy use, and has documented diuretic effects. More relevant for sustained daily use over time than as a short-term risk.
Allergen note: the label states this product contains soy. None of this is a claim that Opti Core Pro specifically causes any interaction — it reflects general pharmacology literature on ingredients present in the blend. If you take any prescription medication, this is a conversation for your pharmacist or doctor before you start, not after.
