{"count":6,"index":{"built_at":"2026-07-27T17:08:49.237469+00:00","public_records":55311,"revision":"ece9c704157d3391676a539b"},"query":{"area":null,"kind":null,"lang":null,"limit":10,"match_mode":"all_terms","q":"Evidence check: Selen in the context of fertility"},"results":[{"answer":"Selenium is an essential trace mineral that, as part of selenoproteins (e.g., glutathione peroxidases), plays a key role in antioxidant defense and thyroid metabolism – both factors that can influence fertility. In men, selenium is important for sperm production and motility; in women, it may support ovarian function and early pregnancy maintenance. Observational studies suggest that low selenium levels are associated with reduced fertility outcomes, but randomized controlled trials are limited and show mixed results. The evidence is moderate at best: plausible mechanistic pathways exist, but effect sizes are small and often confounded by other nutrients (e.g., zinc, iodine). Importantly, selenium supplementation is only beneficial if a deficiency exists; excess selenium can be toxic (selenosis) and may even impair fertility. Genetic variants in selenoprotein genes (e.g., SEPP1, GPX1) can modulate selenium metabolism, but routine testing is not clinically recommended. A blood test (serum or whole blood selenium) is more informative than a DNA test. Overall, selenium is a relevant but not decisive factor in fertility. Evidence grade: human-moderate to mechanistic. Caution: do not exceed the tolerable upper intake level (400 µg/day for adults).","area":"gesundheit","canonical_id":"gesundheit:canonical-3233fb40052d385f542d0810","id":"public-3ca58a4ae795ca571a9337ed","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Selen in the context of fertility","score":23.13798296,"snippet":"Selenium is an essential trace mineral that, as part of selenoproteins (e.g., glutathione peroxidases), plays a key role in antioxidant defense and thyroid metabolism – both factors that can influence fertility. In men, selenium is important for sperm production and motility; in women, it may support ovarian function and early pregnancy maintenance. Observational studies suggest that low selenium levels are associated with reduced fertility outcomes, but randomized controlled trials are limited and show mixed results. The evidence is moderate at best: plausible mechanistic pathways exist, but effect sizes are small and often confounded by other nutrients (e.g., zinc, iodine). Importantly, se","sources":[],"title":"Evidence check: Selen in the context of fertility","url":"https://tikki.wiki/wissen/gesundheit/frage/public-3ca58a4ae795ca571a9337ed/evidence-check-selen-in-the-context-of-fertility/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"Selenium is an essential trace element important for thyroid function and antioxidant defense, both of which can influence fertility. Observational studies suggest links between low selenium levels and male infertility (e.g., reduced sperm quality) as well as female reproductive issues. However, the evidence is moderate: no large randomized controlled trials clearly demonstrate benefit from selenium supplementation in individuals with adequate status. Most data come from case-control or cohort studies with mixed results. Moreover, selenium is toxic at high doses (selenosis), so supplementation without prior lab testing is not advisable. In practice, selenium is often marketed as a 'fertility booster,' which overstates the evidence. A blood test for selenium may be useful if deficiency is suspected, but it does not replace a comprehensive fertility workup. In summary: selenium deficiency can impair fertility, but supplementation without deficiency is not evidence-based and carries risks.","area":"gesundheit","canonical_id":"gesundheit:canonical-d0d36b3494ba35fac6d13817","id":"public-2e9f6a3e54221fea7ecbf849","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Selen in the context of Fruchtbarkeit","score":22.92471966,"snippet":"Selenium is an essential trace element important for thyroid function and antioxidant defense, both of which can influence fertility. Observational studies suggest links between low selenium levels and male infertility (e.g., reduced sperm quality) as well as female reproductive issues. However, the evidence is moderate: no large randomized controlled trials clearly demonstrate benefit from selenium supplementation in individuals with adequate status. Most data come from case-control or cohort studies with mixed results. Moreover, selenium is toxic at high doses (selenosis), so supplementation without prior lab testing is not advisable. In practice, selenium is often marketed as a 'fertility","sources":[],"title":"Evidence check: Selen in the context of Fruchtbarkeit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-2e9f6a3e54221fea7ecbf849/evidence-check-selen-in-the-context-of-fruchtbarkeit/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"A nutrient check in the context of fertility can be useful, as certain micronutrients such as folate, vitamin D, zinc, selenium, and omega-3 fatty acids have established roles in reproduction. However, the evidence for a broad, non-targeted nutrient check is limited. Many tests measure only serum levels or genetic variants that do not always reflect actual needs or bioavailability. For example, low vitamin D levels have been associated with fertility issues, but causality is not firmly established (PMID 25664836). Reference ranges also vary by laboratory and population. A nutrient check should therefore not be considered a standalone diagnostic tool but rather a screening aid that must be interpreted alongside clinical evaluation and a comprehensive history. The risk of misinterpretation is high, especially with home tests lacking medical supervision. In summary, a nutrient check can provide clues but does not replace professional fertility assessment. The evidence is moderate and highly dependent on the specific nutrient.","area":"gesundheit","canonical_id":"gesundheit:canonical-32ce06f41d1fa8bf4aadf9f8","id":"public-9c0bac2e60006110adb63090","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Nährstoffcheck in the context of Fruchtbarkeit","score":20.77670077,"snippet":"A nutrient check in the context of fertility can be useful, as certain micronutrients such as folate, vitamin D, zinc, selenium, and omega-3 fatty acids have established roles in reproduction. However, the evidence for a broad, non-targeted nutrient check is limited. Many tests measure only serum levels or genetic variants that do not always reflect actual needs or bioavailability. For example, low vitamin D levels have been associated with fertility issues, but causality is not firmly established (PMID 25664836). Reference ranges also vary by laboratory and population. A nutrient check should therefore not be considered a standalone diagnostic tool but rather a screening aid that must be in","sources":[],"title":"Evidence check: Nährstoffcheck in the context of Fruchtbarkeit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-9c0bac2e60006110adb63090/evidence-check-naehrstoffcheck-in-the-context-of-fruchtbarkeit/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"Whether a nutrient check (Nährstoffcheck) can help with fertility cannot be definitively answered from the provided context. Such tests typically measure blood levels of vitamins, minerals, and trace elements. Some nutrients (e.g., folate, zinc, selenium, vitamin D) are known to influence fertility. However, the evidence is complex: a deficiency may impair fertility, but normal levels do not guarantee fertility. Many other factors—hormonal status, age, lifestyle, genetics—are equally important. The provided knowledge base contains no direct studies or guidelines on nutrient checks and fertility. Therefore, the evidence grade is unclear. A nutrient check may be useful as part of a broader diagnostic workup, but it does not replace a medical fertility evaluation. Caveat: Without clinical validation of the specific test, its benefit remains speculative.","area":"gesundheit","canonical_id":"gesundheit:canonical-87bcfd6e237b2ef487f1013e","id":"public-43dd9d2db5bd4854b5d7d4ec","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Can Nährstoffcheck help with fertility?","score":20.60045625,"snippet":"Whether a nutrient check (Nährstoffcheck) can help with fertility cannot be definitively answered from the provided context. Such tests typically measure blood levels of vitamins, minerals, and trace elements. Some nutrients (e.g., folate, zinc, selenium, vitamin D) are known to influence fertility. However, the evidence is complex: a deficiency may impair fertility, but normal levels do not guarantee fertility. Many other factors—hormonal status, age, lifestyle, genetics—are equally important. The provided knowledge base contains no direct studies or guidelines on nutrient checks and fertility. Therefore, the evidence grade is unclear. A nutrient check may be useful as part of a broader dia","sources":[],"title":"Can Nährstoffcheck help with fertility?","url":"https://tikki.wiki/wissen/gesundheit/frage/public-43dd9d2db5bd4854b5d7d4ec/can-naehrstoffcheck-help-with-fertility/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The usefulness of a nutrient check (Nährstoffcheck) for fertility depends on context. Certain nutrients—folate, vitamin D, zinc, selenium—are critical for reproductive health, and deficiencies can impair fertility. A targeted blood test can identify such deficiencies, allowing supplementation. However, evidence that routine comprehensive nutrient screening improves fertility outcomes in all couples is limited. Most support comes from clinical practice and observational studies, not large randomized trials. Moreover, many commercial tests (e.g., IgG food intolerance panels) lack validation for fertility. A focused check based on individual risk factors (diet, medical history) may be beneficial, but broad testing without indication is not evidence-based. Caveat: Results must be interpreted alongside overall health, not as standalone predictors.","area":"gesundheit","canonical_id":"gesundheit:canonical-12288fb4eec93f9239dc226f","id":"public-6b0362d08e9ac9cfa80fb1b3","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Is Nährstoffcheck useful for fertility?","score":20.57840557,"snippet":"The usefulness of a nutrient check (Nährstoffcheck) for fertility depends on context. Certain nutrients—folate, vitamin D, zinc, selenium—are critical for reproductive health, and deficiencies can impair fertility. A targeted blood test can identify such deficiencies, allowing supplementation. However, evidence that routine comprehensive nutrient screening improves fertility outcomes in all couples is limited. Most support comes from clinical practice and observational studies, not large randomized trials. Moreover, many commercial tests (e.g., IgG food intolerance panels) lack validation for fertility. A focused check based on individual risk factors (diet, medical history) may be beneficia","sources":[],"title":"Is Nährstoffcheck useful for fertility?","url":"https://tikki.wiki/wissen/gesundheit/frage/public-6b0362d08e9ac9cfa80fb1b3/is-naehrstoffcheck-useful-for-fertility/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The question of which supplements make sense for fertility is valid, but the evidence is mixed. MyBody-X offers a fertility test that may analyze hormones, nutrients, or genetic markers. However, the provided context lacks specific data on supplements. Generally, folic acid (400–800 µg/day) for women before conception is well-supported, as is vitamin D if deficient. Coenzyme Q10 (200–600 mg) and omega-3 fatty acids (EPA/DHA) show moderate effects on egg quality and sperm parameters in studies. Zinc, selenium, and vitamin C are discussed for men, but data are heterogeneous. Importantly, many supplements are overhyped without robust RCTs proving benefit. A genetic test for MTHFR variants may hint at folate metabolism, but clinical utility is limited. MyBody-X tests can identify deficiencies but do not replace medical advice. Safety note: High doses of fat-soluble vitamins (A, E) can be teratogenic. Evidence grade: mixed – some supplements have moderate human studies, many only mechanistic or animal data.","area":"gesundheit","canonical_id":"gesundheit:canonical-40bfe7a3e8b494cbfd198a95","id":"public-2df05c4cff11b6ca3641c35c","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Fertility Check | Fruchtbarkeits-Test: which supplements make sense?","score":20.19140307,"snippet":"The question of which supplements make sense for fertility is valid, but the evidence is mixed. MyBody-X offers a fertility test that may analyze hormones, nutrients, or genetic markers. However, the provided context lacks specific data on supplements. Generally, folic acid (400–800 µg/day) for women before conception is well-supported, as is vitamin D if deficient. Coenzyme Q10 (200–600 mg) and omega-3 fatty acids (EPA/DHA) show moderate effects on egg quality and sperm parameters in studies. Zinc, selenium, and vitamin C are discussed for men, but data are heterogeneous. Importantly, many supplements are overhyped without robust RCTs proving benefit. A genetic test for MTHFR variants may h","sources":[],"title":"Fertility Check | Fruchtbarkeits-Test: which supplements make sense?","url":"https://tikki.wiki/wissen/gesundheit/frage/public-2df05c4cff11b6ca3641c35c/fertility-check-fruchtbarkeits-test-which-supplements-make-sense/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}}],"schema_version":"tikki.search-response.v1"}