Nutricost Horny Goat Weed Extract (600 mg, 180 caps) Review

It's a slightly looser standardisation spec. Icariin is one specific prenylated flavonoid; 'flavones' (or total flavonoids) is a broader category that includes icariin but isn't limited to it. So '10% flavones' tells you the extract is standardised to a class of compounds rather than to icariin specifically — you don't know exactly how much icariin is in there. That's not a red flag (it's still a standardised extract from a reputable value brand), but it is less precise than the picks that state an icariin percentage directly, like Double Wood (20% icariins) or Toniiq (40% icariins). It's the main reason Nutricost ranks on value rather than on potency disclosure.

Yes — at roughly $0.08 per capsule across 180 single-capsule servings, it's the lowest cost-per-serving on the list, and 180 servings is by far the longest supply (six months at one a day). That combination makes it the obvious choice for anyone who's decided to take horny goat weed consistently over the long term and wants maximum days-per-dollar. If you'd rather have a higher disclosed icariin percentage or a stated testing program and don't mind paying more, the standardised-icariin extracts higher on the list are better on those axes.

No — keep the expectation grounded. Horny goat weed's active flavonoid, icariin, inhibits PDE5 in the test tube (Xin 2003, PMID 12646997), but no robust human trial shows standalone Epimedium treats erectile dysfunction or reliably raises libido. Nutricost's value is that it makes a long daily run affordable, not that it delivers a proven clinical effect — and because it discloses flavones rather than icariin, you have a little less certainty about the active content. Use it as an inexpensive traditional vitality tonic with a measured expectation; for actual ED, see a clinician.

Only if you're vegetarian or vegan — Nutricost uses a gelatin capsule, which is animal-derived, so it won't suit those diets. For everyone else it's a non-issue. If you specifically need a vegan capsule, Nature's Way (#4) uses a vegetable capsule (and is non-GMO and gluten-free) from a trusted brand, though at a higher cost per serving and a lower count. The gelatin capsule is part of how Nutricost keeps the price so low.

It's a fair consideration, not a dealbreaker. Nutricost is a established high-volume value brand and the listing presents a clean single-herb extract, but it doesn't prominently advertise an independent third-party potency or heavy-metal test the way Double Wood (which states a heavy-metal panel) or Nootropics Depot (which publishes per-batch COAs) do. For a botanical, that testing is genuinely reassuring, so if it matters a lot to you, those picks are stronger on the purity axis. If you mainly want clean, cheap, long-supply epimedium and are comfortable with a reputable value brand's standard QC, Nutricost is fine.

1. [1] Xin 2003 PMID 12646997 — Effects of icariin on cGMP-specific PDE5 and cAMP-specific PDE4 activities. In vitro, icariin inhibited cGMP-specific PDE5 with an IC50 of 0.432 µmol/L — the mechanistic basis for the herb's reputation, but a bench/enzyme finding, not proof of a human erectile-function benefit. Especially relevant here since the label standardises to flavones, not icariin specifically.
2. [2] Zhang 2007 PMID 17419678 — Epimedium-derived phytoestrogen flavonoids exert beneficial effect on preventing bone loss in late postmenopausal women: a 24-month randomized, double-blind and placebo-controlled trial. 60 mg/day icariin preserved bone mineral density over 24 months in postmenopausal women — the strongest human RCT for Epimedium, and a bone outcome rather than a sexual one. Cited to keep expectations calibrated to the actual evidence base.