{"count":4,"index":{"built_at":"2026-07-27T03:25:41.187671+00:00","public_records":55311,"revision":"742a3e91cde2736452ec1340"},"query":{"area":null,"kind":null,"lang":null,"limit":10,"match_mode":"all_terms","q":"Evidence check: CYP2C19 in the context of fertility"},"results":[{"answer":"The role of CYP2C19 in fertility is not well supported by strong evidence. CYP2C19 is a drug-metabolizing enzyme primarily involved in the breakdown of medications such as certain antidepressants (e.g., citalopram) and proton pump inhibitors. Some mechanistic studies suggest a possible influence on estrogen metabolism, but clinical data linking CYP2C19 variants directly to fertility outcomes are limited and inconsistent. Therefore, genetic testing for CYP2C19 is not recommended as a fertility assessment tool. Its main relevance lies in pharmacogenetics: variants can affect drug efficacy and side effects, which may indirectly impact fertility if medications are used. For fertility evaluation, established markers like AMH, FSH, and lifestyle factors are more evidence-based. The evidence level for CYP2C19 in fertility is best described as mechanistic/unclear.","area":"gesundheit","canonical_id":"gesundheit:canonical-c6d62ea042c356180906af29","id":"public-36b8e38a25b0d195a985ab7c","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: CYP2C19 in the context of fertility","score":24.01264341,"snippet":"The role of CYP2C19 in fertility is not well supported by strong evidence. CYP2C19 is a drug-metabolizing enzyme primarily involved in the breakdown of medications such as certain antidepressants (e.g., citalopram) and proton pump inhibitors. Some mechanistic studies suggest a possible influence on estrogen metabolism, but clinical data linking CYP2C19 variants directly to fertility outcomes are limited and inconsistent. Therefore, genetic testing for CYP2C19 is not recommended as a fertility assessment tool. Its main relevance lies in pharmacogenetics: variants can affect drug efficacy and side effects, which may indirectly impact fertility if medications are used. For fertility evaluation,","sources":[],"title":"Evidence check: CYP2C19 in the context of fertility","url":"https://tikki.wiki/wissen/gesundheit/frage/public-36b8e38a25b0d195a985ab7c/evidence-check-cyp2c19-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":"The evidence for CYP2C19 in fertility is weak. CYP2C19 is a drug-metabolizing enzyme, primarily relevant for medications like clomiphene and letrozole used in fertility treatments. Some studies suggest that genetic variants (*2, *3, *17) may modestly affect drug metabolism and treatment outcomes, but effect sizes are small, population-specific, and not clinically actionable. No major medical society recommends routine CYP2C19 testing for fertility. Direct-to-consumer tests often overstate the relevance. Evidence is 'mixed': mechanistic plausibility and a few association studies exist, but no RCTs demonstrate benefit. Dietary or supplement adjustments based on CYP2C19 are unsupported. Fertility management should rely on established clinical protocols.","area":"gesundheit","canonical_id":"gesundheit:canonical-9d9f96492d50697ec28d9f03","id":"public-3968441822bcfbafa38884bc","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: CYP2C19 in the context of Fruchtbarkeit","score":23.76207378,"snippet":"The evidence for CYP2C19 in fertility is weak. CYP2C19 is a drug-metabolizing enzyme, primarily relevant for medications like clomiphene and letrozole used in fertility treatments. Some studies suggest that genetic variants (*2, *3, *17) may modestly affect drug metabolism and treatment outcomes, but effect sizes are small, population-specific, and not clinically actionable. No major medical society recommends routine CYP2C19 testing for fertility. Direct-to-consumer tests often overstate the relevance. Evidence is 'mixed': mechanistic plausibility and a few association studies exist, but no RCTs demonstrate benefit. Dietary or supplement adjustments based on CYP2C19 are unsupported. Fertili","sources":[],"title":"Evidence check: CYP2C19 in the context of Fruchtbarkeit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-3968441822bcfbafa38884bc/evidence-check-cyp2c19-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":"The pharmacogenetics Medicheck in the context of fertility claims to identify genetic variants that affect the metabolism of hormone or fertility drugs. However, the scientific evidence is limited. While some SNPs in CYP2C19, CYP2D6, or FSH receptor genes may modulate the efficacy of clomiphene, letrozole, or gonadotropins, effect sizes are generally small and clinical relevance remains unclear. Most studies are mechanistic or observational; randomized controlled trials are lacking. Commercial tests often overlook polygenicity and environmental factors. A positive result should not lead to self-adjustment of medication. Pharmacogenetics in reproductive medicine is an emerging field but not yet standard practice. Medical supervision is essential. The evidence is rated as 'mixed': there are mechanistic and GWAS data, but insufficient validation for routine use.","area":"gesundheit","canonical_id":"gesundheit:canonical-4583393248669dc805c01413","id":"public-1f5369b593cc2006e97d52f1","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Pharmakogenetik Medicheck in the context of Fruchtbarkeit","score":21.40999946,"snippet":"The pharmacogenetics Medicheck in the context of fertility claims to identify genetic variants that affect the metabolism of hormone or fertility drugs. However, the scientific evidence is limited. While some SNPs in CYP2C19, CYP2D6, or FSH receptor genes may modulate the efficacy of clomiphene, letrozole, or gonadotropins, effect sizes are generally small and clinical relevance remains unclear. Most studies are mechanistic or observational; randomized controlled trials are lacking. Commercial tests often overlook polygenicity and environmental factors. A positive result should not lead to self-adjustment of medication. Pharmacogenetics in reproductive medicine is an emerging field but not y","sources":[],"title":"Evidence check: Pharmakogenetik Medicheck in the context of Fruchtbarkeit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-1f5369b593cc2006e97d52f1/evidence-check-pharmakogenetik-medicheck-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":"The provided context does not contain specific information about the 'Body-Balance Check | Testosteron-Test' or its role in fertility. In general, testosterone testing can indicate hormonal imbalances that may affect fertility in both men and women – for example, in cases of hypogonadism or PCOS. However, direct-to-consumer tests often use saliva samples, which have limited accuracy for diagnosing fertility issues. Clinical blood tests and medical evaluation are essential for reliable fertility assessment. Without product-specific evidence from the given sources, the relevance of this test for fertility remains unclear. The context documents cover unrelated topics (e.g., DNA Nutrition Test, microbiome, CYP2C19) and do not support any direct claim. Therefore, the evidence is rated as 'unclear' or 'marketing'. Consumers should critically evaluate whether such a test is scientifically validated and relevant to their individual fertility concerns.","area":"gesundheit","canonical_id":"gesundheit:canonical-f030819adf05e39c1d836b08","id":"public-8589e747e7322ac25630529c","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"What role does Body-Balance Check | Testosteron-Test play in Fruchtbarkeit?","score":20.79157492,"snippet":"The provided context does not contain specific information about the 'Body-Balance Check | Testosteron-Test' or its role in fertility. In general, testosterone testing can indicate hormonal imbalances that may affect fertility in both men and women – for example, in cases of hypogonadism or PCOS. However, direct-to-consumer tests often use saliva samples, which have limited accuracy for diagnosing fertility issues. Clinical blood tests and medical evaluation are essential for reliable fertility assessment. Without product-specific evidence from the given sources, the relevance of this test for fertility remains unclear. The context documents cover unrelated topics (e.g., DNA Nutrition Test, ","sources":[],"title":"What role does Body-Balance Check | Testosteron-Test play in Fruchtbarkeit?","url":"https://tikki.wiki/wissen/gesundheit/frage/public-8589e747e7322ac25630529c/what-role-does-body-balance-check-testosteron-test-play-in-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"}}],"schema_version":"tikki.search-response.v1"}