Stevia

<h3> Absolute Contraindications of Stevia </h3> <h4>Pregnancy and Early Development (avoid high-dose/excess use)</h4> <ul> <li>🤰 <li>Recommendation: Avoid high-dose stevia extracts during pregnancy and do not use medicinal/large supplemental doses; discuss any regular use with your obstetrician. <li>Reasoning: Some animal developmental studies report fetal/maternal toxicity at very high steviol doses in pregnant animals; human safety data in pregnancy are limited so caution is advised. <li>Scientific_Study_Title: Developmental toxicity of steviol, a metabolite of stevioside, in the hamster. <li>Scientific_Study_Authors: Toyoda K, et al. <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/9598301/ <li>Scientific_Study_Excerpt: <p>In this experimental study, pregnant hamsters dosed with high amounts of steviol (0.75-1.0 g/kg BW/day) during organogenesis showed marked maternal and fetal toxicity, including reduced maternal weight gain, increased maternal mortality, and reduced numbers and weights of live fetuses. At the intermediate dose (0.5 g/kg/day) toxicity was less but still present. The authors concluded that at very high doses steviol produced developmental toxicity in hamsters; these doses are far higher than typical dietary exposures in humans.</p> </ul> <h4>Prepubertal / Developing Males - Chronic high-dose exposure (avoid medicinal use)</h4> <ul> <li>🚫 <li>Recommendation: Avoid chronic high-dose stevia extracts in prepubertal boys or animals; do not use medicinal doses without pediatric specialist advice. <li>Reasoning: Animal studies report reduced reproductive organ weights, lowered sperm concentrations and potential reductions in testosterone after prolonged, high-dose stevia extracts - suggesting possible effects on male reproductive development in rodents. <li>Scientific_Study_Title: Effects of chronic administration of Stevia rebaudiana on fertility in rats. <li>Scientific_Study_Authors: Cainelli CE, et al. <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/10619379/ <li>Scientific_Study_Excerpt: <p>In prepubertal male rats given prolonged aqueous Stevia extract, investigators observed decreased final weights of testes, seminal vesicles and epididymal structures, lower fructose content in accessory glands, and reduced epididymal sperm concentration. Plasma testosterone tended to be lower; luteinizing hormone levels were unchanged. The authors suggested chronic high-dose exposure affected male reproductive organs and sperm parameters in this rat model.</p> </ul> <h4>Basal Low Blood Pressure / Uncontrolled Hypotension</h4> <ul> <li>⚠️ <li>Recommendation: Do not use stevia medicinally if you already have chronically low blood pressure or symptomatic hypotension without physician approval. <li>Reasoning: Multiple human trials demonstrate that stevioside can lower blood pressure in hypertensive patients; therefore in people with low baseline blood pressure or taking multiple antihypertensives, further lowering may be unsafe. <li>Scientific_Study_Title: A double-blind placebo-controlled study of the effectiveness and tolerability of oral stevioside in human hypertension. <li>Scientific_Study_Authors: Hsieh MH, et al. <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/10971305/ <li>Scientific_Study_Excerpt: <p>This randomized, double-blind trial in hypertensive patients found that oral stevioside (250 mg TID) significantly reduced systolic and diastolic blood pressure over months; effects persisted throughout the year. No major adverse events were reported in that hypertensive population. Because the compound reproducibly lowers blood pressure in patients with hypertension, the study supports caution or avoidance in people with low baseline pressures or on multiple blood-pressure medications.</p> </ul> <h3> Relative Contraindications of Stevia </h3> <h4>Concurrent use with sulfonylurea antidiabetic drugs (e.g., glimepiride)</h4> <ul> <li>💊 <li>Recommendation: Use with caution; consult your prescribing clinician and monitor blood glucose closely if combining stevia supplements with sulfonylureas or insulin-secreting drugs. <li>Reasoning: Metabolites of steviol are handled by renal transporters (OAT3). Certain antidiabetic drugs (and other drugs) can inhibit OAT3 and alter steviol metabolite levels; this can modify exposure and theoretically influence blood-glucose effects. <li>Scientific_Study_Title: Interaction of Organic Anion Transporter 3-Mediated Uptake of Steviol Acyl Glucuronide, a Major Metabolite of Rebaudioside A, with Selected Drugs. <li>Scientific_Study_Authors: Chen M-L, et al. <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/31760750/ <li>Scientific_Study_Excerpt: <p>Laboratory and in vivo data showed SVAG (a chief metabolite) is an OAT3 substrate. Probenecid and glimepiride potently inhibited OAT3-mediated SVAG transport (IC50 4.9 and 0.8 μM, respectively). Co-administration elevated plasma SVAG Cmax and AUC after rebaudioside A dosing, indicating drugs that inhibit OAT3 can increase circulating steviol metabolites and alter pharmacokinetics.</p> </ul> <h4>Concomitant use with drugs relying heavily on UGT2B7 (e.g., diclofenac as a model UGT2B7 substrate)</h4> <ul> <li>⚗️ <li>Recommendation: If you take medications metabolized primarily by UGT2B7, discuss stevia supplements with your clinician; they may recommend monitoring or dose adjustments. <li>Reasoning: Steviol is glucuronidated mainly by UGT2B7. Drugs that strongly inhibit or compete at UGT2B7 may alter steviol clearance or vice versa. <li>Scientific_Study_Title: Steviol glucuronidation and its potential interaction with UDP-glucuronosyltransferase 2B7 substrates. <li>Scientific_Study_Authors: Liang Y, et al. <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/24296138/ <li>Scientific_Study_Excerpt: <p>In human liver microsomes and recombinant UGT systems, steviol glucuronidation was primarily mediated by UGT2B7 (at low concentrations) and by UGT2B7 plus UGT1A3 at higher concentrations. Inhibition studies showed diclofenac inhibited steviol glucuronidation (Ki ≈ 4.2 μM), implying potential for mutual alteration of clearance when co-administered with potent UGT2B7 substrates or inhibitors.</p> </ul> <h4>History of GI sensitivity / functional gut disorders (IBS, frequent GI upset)</h4> <ul> <li>🤢 <li>Recommendation: If you experience recurrent bloating, diarrhea, or abdominal pain with sweeteners, test a small amount or avoid stevia extracts; consult a gastroenterologist if severe. <li>Reasoning: Clinical trials and reviews report gastrointestinal adverse events (abdominal fullness, epigastric pain, diarrhea) in some people consuming steviol glycosides. <li>Scientific_Study_Title: Effect of the natural sweetener, steviol glycoside, on cardiovascular risk factors: a systematic review and meta-analysis of randomised clinical trials. <li>Scientific_Study_Authors: Gardana C, et al. <li>Scientific_Study_Link: https://pubmed.ncbi.nlm.nih.gov/25412840/ <li>Scientific_Study_Excerpt: <p>The systematic review and meta-analysis noted adverse events reported across trials, including abdominal fullness, epigastric pain and dizziness. Heterogeneity between trials was substantial, but GI complaints were among the most commonly reported tolerability issues linked to steviol glycoside consumption in randomized trials.</p> </ul>