NOW Foods TestoJack 300 Review

NOW Foods' brand-level QC is one of the strongest in the supplement industry — they pioneered third-party lab transparency before it was an industry expectation. That earns the bottle a 9.0 on label trust + lab transparency. Where it loses ground is standardisation: the Supplement Facts panel lists the 300 mg dose as a proprietary EuryGold™ blend of Eurycoma longifolia (Tongkat Ali) root extract and citrus bergamot fiber, with no breakdown of how much of that 300 mg is actual Tongkat extract and no declared eurycomanone percentage. The brand's QC discipline can't verify a dose the label itself doesn't fully break out.

It lands at the floor of the trial range by gross weight — Talbott 2013 ran 200 mg/day Physta, Henkel ran 400 mg/day. But NOW's label states 300 mg total of its EuryGold™ blend, not 300 mg of plain Tongkat extract — the blend also includes citrus bergamot fiber, and the panel doesn't say how the 300 mg splits between the two. Without a declared eurycomanone percentage or an extract-vs-fiber breakdown, you can't confirm how much of that 300 mg is doing the work. Most users settle on 1-2 caps daily. The gross dose isn't undersold; the standardisation visibility is.

Not on this bottle. We photographed and read the Supplement Facts panel for this ASIN on Sep 7, 2026, and it lists a single active-ingredient line — 300 mg of NOW's EuryGold™ blend (Eurycoma longifolia extract plus citrus bergamot fiber). No Tribulus terrestris appears on the panel. An earlier version of this review described a 150 mg Tribulus addition; that composition doesn't match the label we verified, and every place it appeared in this review has been corrected.

No — same correction as the Tribulus question above. The Supplement Facts panel for this ASIN lists one active-ingredient line, the 300 mg EuryGold™ Tongkat blend; Stinging Nettle isn't printed on it. If you're looking for a Tongkat-plus-Nettle combination product, that's not what this specific bottle's label shows — check the panel on whatever bottle you actually receive.

TestoJack 200 is the smaller-dose version (200 mg Tongkat instead of 300 mg). Same EuryGold formula approach, same QC, just less Tongkat blend per cap. For the price difference (~$3-4/month), TestoJack 300 is the better value if you're going to commit to the bottle — you stay inside the trial dose range with one cap instead of needing 1.5. If you want the cheapest possible NOW Foods Tongkat, the 200 is fine; if you want trial-dose adequacy in a single cap, 300 is the right pick.

Double Wood LJ100 is the trial-extract patent — what the research literally measured. Toniiq UHP is maximum per-cap eurycomanone. NOW TestoJack 300 is the trusted-brand familiar option — you get NOW Foods' decades of QC discipline, but you pay for that in disclosure: a proprietary blend instead of a plainly-dosed single extract. Pick TestoJack 300 if 'NOW Foods' is the brand you trust enough to swallow daily; pick Double Wood LJ100 or Toniiq if protocol-fidelity or per-cap-potency matters more.

If you're a Tongkat responder, yes — but the response will be softer than on standardised extracts because the active dose-per-cap is lower (300 mg unstandardised vs 100 mg LJ100 vs 200 mg Physta). Expect libido + morning erection shifts at 3-4 weeks, energy + mood around week 5, and bloodwork changes around week 8-10 IF you're going to respond. If 8 weeks on TestoJack 300 produces no shift, the next experiment is upgrading to LJ100 (the trial extract) before declaring non-response.

1. [1] Talbott 2013 PMID 23705671 — Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. 200 mg/day standardised Tongkat for 4 weeks reduced cortisol 16% and raised testosterone 37% in stressed adults vs placebo. Establishes the trial-dose range TestoJack 300 falls into at the gross-weight level.
2. [2] Tambi 2012 PMID 21671978 — Standardised water-soluble extract of Eurycoma longifolia, Tongkat Ali, as testosterone booster for managing men with late-onset hypogonadism. 200 mg/day standardised Tongkat for 1 month raised testosterone into the lower normal range in hypogonadal subjects. Frames the active-marker dose TestoJack 300 is approximating without standardisation visibility.
3. [3] Henkel 2014 PMID 23754792 — Tongkat Ali as a potential herbal supplement for physically active male and female seniors — a pilot study. 400 mg/day standardised Tongkat improved free T and grip strength in active seniors over 5 weeks. Higher-end of the dose range TestoJack 300 maps onto.
4. [4] George & Henkel 2014 PMID 24386995 — Phytoandrogenic properties of Eurycoma longifolia as natural alternative to testosterone replacement therapy. Systematic review of mechanism and clinical evidence across standardised Tongkat extracts. Frames the case that effect sizes track active-marker dose — the standardisation visibility TestoJack 300 omits.
5. [5] Chen 2014 PMID 25013692 — Supplementation of Eurycoma longifolia Jack extract for 6 weeks does not affect urinary testosterone:epitestosterone ratio, liver and renal functions in male recreational athletes. Safety dataset on standardised Tongkat over 6 weeks at trial dose. Confirms Tongkat's clean hepatic/renal safety profile applies to TestoJack 300's dose range.