Seahorse
Hippocampus · Hǎi Mǎ 海马
A dried-seahorse 'tonic' with no evidence and high conservation cost.
Evidence tier
No Evidence
Research weight
Not supported
Citations
24 verified / 24
Classification
TCM Herb
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What the evidence says. No credible human evidence supports the marketed claims — widely considered ineffective.
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No credible evidence. The claims below are what marketers assert — not what science supports. This entry is included so you can recognise it.
What is Seahorse?
Seahorse (Hippocampus · Hǎi Mǎ 海马) is a traditional Chinese medicine herb marketed for impotence & libido ('natural viagra'). NutriDex grades the human evidence as No Evidence. Dried seahorse is used in TCM for impotence, asthma and as a general 'Yang' tonic. While some reviews note bioactive compounds, there is no scientific evidence dried seahorse delivers the effects claimed. The trade is enormous — tens of millions of seahorses harvested yearly — and many species are now classed as Vulnerable, making this a significant conservation concern.
Marketed Claims (unproven)
✕(Claimed) impotence & libido ('natural Viagra')
✕(Claimed) asthma & 'Kidney-Yang' tonic
Dosing & Compounds
Use & Legality
No established therapeutic use; trade raises serious conservation concerns.
Active Compounds
Safety & Cautions
No demonstrated benefit. Major conservation harm — wild seahorse populations are declining sharply due to demand. Educational only — always check with your doctor or pharmacist before combining Seahorse with any medicine.
Evidence & Risk Findings ★ 24 studies
environmental/toxicology study
Liu et al., Front Mar Sci 2022 (contaminant bioaccumulation)
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In 84 wild seahorses (H. mohnikei, H. kelloggi, H. trimaculatus) from nine coastal Chinese sites, tissues accumulated heavy metals (elevated Cu, Cr), benzo(a)pyrene (1.6-8.7 ug/kg) and 92-322 intestinal microplastic particles per individual, raising contaminant-safety concerns for ingested seahorse products.
review
Foster et al., Project Seahorse/CITES 2023 (Appendix II implementation)
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Review of CITES Appendix II implementation found persistent non-compliance and trafficking despite national export suspensions, with millions of seahorses still traded among 80+ countries mainly for TCM.
review
Pollom et al. / IUCN Red List 2023 (conservation status)
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Of 42 assessed Hippocampus species, 14 are threatened (12 Vulnerable, 2 Endangered) with several declining >=30% within three generations, driven largely by TCM-targeted overfishing and bycatch (~37 million caught/year).
narrative/integrative review
Naunyn-Schmiedeberg's Arch Pharmacol 2026 (Alzheimer's integrated review)
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Integrated review of seahorse ethnopharmacology, chemistry, bibliometrics and network pharmacology for Alzheimer's disease concluded seahorses remain an underexplored, preclinical-stage candidate with no demonstrated clinical efficacy, and flagged conservation constraints on any therapeutic development.
Review
Zhang 2024
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Comprehensive review of the genus Hippocampus (~57 species, ~14 medicinal) summarizing chemical constituents (amino acids, peptides, fatty acids, steroids) and reported anti-prostatic-hyperplasia, anti-fatigue and anti-inflammatory activities, with no human clinical-trial evidence cited for impotence/libido.
Review
Cohen / Project Seahorse 2026
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Integrated ethnopharmacology, bioactivity, bibliometrics and network-pharmacology review of medicinal seahorses framing their use within a species-conservation context, finding bioactivity evidence remains preclinical.
Safety / toxicology
Zhang 2016 (Bull Environ Contam Toxicol)
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Bioaccumulation study of 9 metals across four seahorse species from six Chinese coastal sites found location- and tissue-dependent metal accumulation (higher in viscera, muscle and skin; H. kelloggi highest), flagging heavy-metal contamination risk in the tissues used for medicine.
Review
Comprehensive review of genus Hippocampus 2024
✓ PubMed
Up-to-date review of Hippocampus chemical constituents, pharmacological activities and quality-evaluation methods; summarizes reported anti-oxidation, anti-inflammation, anti-depressant, anti-hypertensive, anti-prostatic hyperplasia, antiviral, anti-apoptotic and anti-fatigue effects across ~14 medicinal species, while emphasizing that evidence remains in vitro/in vivo with no controlled human efficacy data.
observational study
Yan et al., PLOS ONE 2023 (US dried seahorse trade)
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Molecular ID of US dried seahorse trade found 8 species; 85.7% of TCM samples met CITES minimum-size recommendations vs only 4.8% of e-commerce/curio samples, indicating widespread non-compliant trade.
observational study
Foster et al., Conservation Biology 2025 (seizure tracking)
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Analysis of ~300 online seizure records (2010-2021) documented ~5 million dried seahorses confiscated across 60+ countries, showing CITES export bans drove trade underground rather than ending it.
Observational
Vaidyanathan 2024
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CITES sustainable-trade study (Conservation Biology 38(5):e14337) reporting seahorse catches in 85% of a surveyed marine protected/exclusion zone with bottom trawlers driving most violations, and fisher-reported declining catch and reduced body size indicating unsustainable exploitation.
review
Stocks/Foster & Vincent, Biological Conservation 2022 (CITES effectiveness)
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CITES Appendix II listing measurably reduced legal seahorse exports across major exporting nations (India, Indonesia, Malaysia, Peru, Philippines, Thailand, Vietnam), the pioneering marine-fish case.
Review
Kumaravel et al. (genus Hippocampus review) 2015
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Comprehensive ethnopharmacological review of the genus Hippocampus: documents traditional use (chiefly TCM 'kidney-yang' invigoration for impotence, fatigue, aging) and catalogs preclinical pharmacology (anti-tumor, antioxidant, anti-fatigue, anti-thrombotic, anti-inflammatory, antihypertensive, neuroprotective). Concludes active constituents are sterols, peptides, essential amino acids, PUFAs and trace elements, and explicitly notes that human clinical trial data are lacking.
Review
Project Seahorse / reviews
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No scientific evidence dried seahorse has the claimed medicinal effects.
animal study
Wahyuni et al., Vet World 2023 (H. comes rat fertility)
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In rats with DMPA-induced subfertility, seahorse (Hippocampus comes) extract improved sperm quality and testosterone, but findings are animal-only and do not validate human medicinal claims.
in vitro study
Chen et al., Food Sci Nutr 2024 (H. trimaculatus anti-inflammatory)
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In cultured three-spot seahorse extract, taurine and arginine were the principal bioactives and the water-layer extract inhibited LPS-induced nitric oxide, COX-2 and TNF-alpha in macrophage cell culture; effects are in vitro only and do not validate human medicinal claims.
animal study
Chen et al., Food Sci Nutr 2025 (seahorse antidepressant, mice)
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In DSS-induced depression-like mice, Hippocampus abdominalis attenuated depressive behaviour by inhibiting hippocampal neuroinflammation and ferroptosis via the Nrf2/HO-1 axis; findings are animal-only with no human efficacy shown.
Mechanism
Hippocampus comes extract (sperm/testosterone) 2023
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In male rats with depo-medroxyprogesterone-acetate-induced reproductive suppression, Hippocampus comes extract improved sperm quality parameters, raised serum testosterone, and normalized serum biochemistry relative to untreated model animals. Rat study only.
Mechanism
Seahorse anti-photoaging peptide (H. abdominalis) 2024
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An antioxidant peptide (SHP2) purified from Hippocampus abdominalis alcalase hydrolysate reduced ROS and protected against UVB-induced photoaging/oxidative damage in vitro and in vivo, upregulating endogenous antioxidant enzymes (SOD, catalase). In vitro + animal evidence only.
preclinical study
Frontiers Mar Sci 2022 (antihypertensive peptides, H. erectus)
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High-throughput omics screen of lined seahorse (Hippocampus erectus) identified putative antihypertensive peptides and their source genes; effects were in silico/preclinical with no human efficacy demonstrated.
Mechanism
Zhang et al. (Hippocampus peptides) 2017
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Enzymatic seahorse (Hippocampus) hydrolysate peptides showed dose-dependent in vitro radical-scavenging/antioxidant activity, and in a mouse forced-swim model significantly prolonged exhaustive swimming time, raised hepatic glycogen, and lowered blood lactate and serum urea nitrogen versus controls, supporting an anti-fatigue mechanism. Preclinical only (in vitro + mice).
Study
Trade data
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>20 million dried seahorses traded yearly; many species Vulnerable (IUCN).
Study
Bioactives
✓ Full text
Some compounds reported but claims remain unconfirmed.
Mechanism
Kim et al. (seahorse extract BPH/oligospermia) 2014
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In a castration + testosterone-induced benign prostatic hyperplasia rat model, seahorse extract reduced prostate weight and index versus untreated BPH controls; in a mouse oligospermatism model it improved sperm parameters. Supports the traditional 'kidney/reproductive' indication but is animal-model evidence, not human.