I Cycled Tongkat Ali for 6 Months (5 Days On, 2 Off) – Full Bloodwork Log

TL;DR: Six months of Tongkat ali cycling (5 days on, 2 days off) at 200mg daily of a Physta-standardized extract. Total T went from 658 to 718 ng/dL. Free T: 18.2 to 22.1 pg/mL. SHBG dropped from 38 to 31 nmol/L. LH increased from 4.8 to 6.1 mIU/mL. Morning cortisol dropped modestly. The gains are real but modest at my baseline — I’ll walk through why that distinction matters before you decide if this is worth adding to your stack.

Why I Decided to Run This

By the time I added Tongkat ali to my stack, I’d already spent the better part of two years optimizing everything upstream. Ron had walked me through the sequencing logic in Anabolic Alchemy: foundational micronutrients first (D3, magnesium, zinc), then sleep and circadian optimization, then the SHBG-specific work. My 90-day boron experiment, which I documented in an earlier article, had moved my SHBG from 58 to 39 nmol/L and my free T from 10.4 to 18.0 pg/mL. Deep sleep was running over 100 minutes most nights. IGF-1 was at 226 ng/mL from the sleep and training work.

The question I was genuinely interested in: what does Tongkat ali do for someone who isn’t deficient in anything? The clinical literature on Tongkat ali is largely from populations with either low baseline T, high stress, or suboptimal micronutrient status. I wanted to see the response in someone who’d already handled those variables. Ron Males’ position — which is laid out in the supplement tier list — is that Tongkat ali is B-tier: real mechanism, variable response, significantly more effective when foundational inputs are in place. I was a reasonable test case for the “inputs in place” condition.

I also had a research motivation. As a software engineer, I’d built my own tracking dashboard and I wanted a longer-term dataset than most Tongkat ali experiments run. Six months with bloodwork every 8 weeks gives four data points. That’s not a controlled clinical trial but it’s more than most n=1 experiments achieve.

The Extract Decision

This is where Jason-the-engineer spent an uncomfortable amount of time before buying anything. My wife’s comment when she saw my browser history was something like “you know normal people just read the label, right.”

Tongkat ali (Eurycoma longifolia) has specific active compounds — eurypeptides and eurycomanone (eurycomanone is a quassinoid compound believed to be one of the primary active fractions responsible for LH stimulation and free testosterone effects) — and the difference between a standardized extract and a raw powder in terms of active compound content can be 10–20 fold or more. Most cheap Tongkat ali products on Amazon are raw root powder, not extract, and many don’t standardize to any specific active.

I chose a product using the Physta extract — a water-soluble standardized form produced by Biotropics Malaysia that’s been used in several of the clinical trials on Tongkat ali. The standardization to eurypeptides is specified on the certificate of analysis. 200mg of this extract daily during on-days is my protocol. I noted the lot number of each batch I purchased — which turned out to matter at week 10 (more on that in a moment).

The Cycling Protocol — Why 5 Days On, 2 Off

The 5-on, 2-off cycling pattern comes from the clinical studies rather than from bro science. The half-life of the eurypeptide fractions doesn’t support continuous daily dosing as clearly superior to pulsed dosing, and there’s a theoretical concern — not well-established in human data but worth noting — that continuous exposure to LH-stimulating compounds might produce receptor adaptation over time. The clinical data supporting testosterone effects in humans used cycling patterns similar to 5/2 or 4/3.

I also appreciated the 2-off days as a natural “washout” window to observe if anything in my wearable data shifted. My Oura readiness scores and HRV on off-days versus on-days over 24 weeks showed no meaningful difference — which tells me the compound isn’t producing day-to-day fluctuations that are measurable at the wearable level. That’s probably a good thing: you want a consistent hormonal environment, not oscillation.

Baseline — Week 0

Marker	Baseline (Week 0)	Units
Total T (morning fasted)	658	ng/dL
Free T (calculated)	18.2	pg/mL
SHBG	38	nmol/L
LH	4.8	mIU/mL
FSH	4.2	mIU/mL
Estradiol	24	pg/mL
IGF-1	226	ng/mL
Morning cortisol	14.2	mcg/dL
Oura HRV (30-day avg)	64	ms

Starting from 658 ng/dL total T is an important context marker. The published clinical data on Tongkat ali tends to show the most dramatic effects in populations starting below 400 ng/dL. At 658, I’m already in the upper-normal range for my age (37), and the ceiling effect is real — the system has less room to move than it would at 400. I expected modest gains. I was reasonably calibrated about this expectation going in.

Week 8 Checkpoint

First bloodwork at 8 weeks. I’d been consistent on the 5/2 protocol — I log everything in a spreadsheet, and I had only one day where I took a dose on what should have been an off-day (calendar confusion, corrected immediately).

Marker	Week 0	Week 8	Change
Total T	658 ng/dL	692 ng/dL	+34
Free T	18.2 pg/mL	20.4 pg/mL	+2.2
SHBG	38 nmol/L	34 nmol/L	-4
LH	4.8 mIU/mL	5.6 mIU/mL	+0.8
Morning Cortisol	14.2 mcg/dL	12.8 mcg/dL	-1.4

The LH movement was what I wanted to see first. Tongkat ali’s primary proposed mechanism is stimulation of LH release — the pituitary signal that tells the Leydig cells in the testes to produce testosterone. The eurypeptide fractions appear to reduce negative estrogen feedback at the pituitary, which allows LH pulsatility to increase. If the mechanism is working, LH should move before T moves substantially, because LH is upstream. Seeing LH go from 4.8 to 5.6 at week 8 was the signal I was looking for.

SHBG dropped 4 points — consistent with the SHBG-lowering effect documented in some trials on Tongkat ali, possibly mediated by the same LH/estrogen pathway.

Ron covers the SHBG mechanism in more depth in the SHBG article, and the boron interaction I’d already seen in my own bloodwork made me curious whether Tongkat was adding a separate SHBG reduction mechanism or overlapping with boron’s. My working theory is they’re at least partly overlapping — both seem to involve modulation of sex hormone feedback at the liver level — but I don’t have the data to confirm this cleanly.

Then the batch problem at week 10. The brand I was using ran out of my original lot and shipped me a new lot from what I later learned was a different supplier for the raw material. I noticed a difference in the capsule appearance and contacted the company. They were transparent about the supplier change but couldn’t provide a certificate of analysis for the new lot on my timeline. I paused for 6 days while I sourced product from a different vendor with current COA documentation.

This is the real-world messiness of supplement quality control that doesn’t show up in clinical trials because clinical trials use standardized study product. The retail market is different. I switched vendors and continued. The 6-day gap is a confound in my data — I’ve noted it and can’t rule out a small effect on the week 16 numbers.

Week 16 Checkpoint

Marker	Week 0	Week 8	Week 16	Change from baseline
Total T	658 ng/dL	692 ng/dL	714 ng/dL	+56
Free T	18.2 pg/mL	20.4 pg/mL	21.8 pg/mL	+3.6
SHBG	38 nmol/L	34 nmol/L	32 nmol/L	-6
LH	4.8 mIU/mL	5.6 mIU/mL	5.9 mIU/mL	+1.1
Morning Cortisol	14.2 mcg/dL	12.8 mcg/dL	12.2 mcg/dL	-2.0
IGF-1	226 ng/mL	—	232 ng/mL	+6

The trajectory continued at week 16, though the rate of change slowed — which is expected. The early gains from Tongkat ali in published research tend to be front-loaded in the first 8–12 weeks, with diminishing returns thereafter. Total T at 714 means 56 ng/dL over 16 weeks from Tongkat alone — a real improvement for someone already at a solid baseline.

Cortisol dropping 2 mcg/dL from 14.2 to 12.2 over 16 weeks is the adaptogenic effect I’d seen referenced in the Tongkat ali literature. Eurycoma has been used in Southeast Asian traditional medicine as a “stress tonic” for centuries, and the proposed mechanism involves modulation of HPA axis activity. Whether my cortisol reduction was Tongkat-specific or simply regression-to-mean (14.2 was already in normal range) I can’t say definitively. But the Oura HRV data also improved slightly in this period — from 64 to 68 ms — which is consistent with reduced sympathetic activation.

Week 24 — Final Results

Marker	Week 0	Week 8	Week 16	Week 24	Total Change
Total T	658	692	714	718	+60 (+9.1%)
Free T	18.2	20.4	21.8	22.1	+3.9 (+21.4%)
SHBG	38	34	32	31	-7 (-18.4%)
LH	4.8	5.6	5.9	6.1	+1.3 (+27.1%)
FSH	4.2	—	—	4.6	+0.4
Estradiol	24	—	—	22	-2
IGF-1	226	—	232	236	+10 (+4.4%)
Morning Cortisol	14.2	12.8	12.2	11.8	-2.4 (-16.9%)
Oura HRV	64 ms	—	68 ms	69 ms	+5 ms

The LH number is the one I find most compelling. A 27% increase in LH over six months — from 4.8 to 6.1 mIU/mL — confirms the upstream mechanism is working. The testosterone increase followed LH, as it should. This is how you want endogenous testosterone stimulation to work: the signal goes up, the production follows. It’s fundamentally different from taking an exogenous androgen, where the signal gets suppressed rather than amplified.

Free testosterone improved 21.4% – more than total T improved (+9.1%) – because the SHBG drop contributed independently to free T availability. These two mechanisms (LH stimulation → more total T produced, SHBG reduction → more of that total T unbound and active) appear to run in parallel on Tongkat ali. Ron explains the free testosterone/SHBG relationship in the context of the 6-12-25 Method training response in the 6-12-25 Method article, and the pattern here is consistent with what he describes about optimizing both numerator and denominator simultaneously.

The plateau at weeks 16–24 (total T only gained 4 ng/dL in the second half) is important to acknowledge. Tongkat ali front-loads its benefits. If you’re expecting continued linear gains through month 6, you’ll be disappointed. The primary gains happen in the first 8–12 weeks, and months 3–6 are about sustaining rather than building on them.

Was the Batch Disruption a Problem?

I included the week 10 vendor issue because it’s the kind of real-world data point that gets omitted from cleaner-looking n=1 experiments. Is there a confound? Probably minor. The 6-day gap at week 10 likely caused a partial washout of the accumulated effect, which might explain why the week 8 to week 16 gain (+22 ng/dL total T) was similar to the baseline to week 8 gain (+34 ng/dL) rather than smaller as I’d expect from the typical plateau curve.

The practical takeaway: brand and lot consistency matter for a 6-month experiment. If you start a Tongkat protocol, source more than one month’s supply upfront from a vendor who publishes lot-specific certificates of analysis. Changing brands mid-experiment isn’t catastrophic, but it’s an unnecessary confound.

How to Use This Information

The honest tier breakdown for Tongkat ali:

Tier 1 (do this first):

• Confirm foundational micronutrients via bloodwork. If vitamin D is below 40 ng/mL, if magnesium intake is inadequate, if zinc is deficient – fix those first. Tongkat ali’s effect size is smaller when foundational deficiencies are present and those deficiencies go unaddressed.

Tier 2 (add Tongkat here):

• Use a Physta or standardized extract product (eurypeptides specified on COA), not raw root powder. 200mg daily during on-days.
• Run 5 days on, 2 days off. Consistent timing — morning or midday, not evening.
• Pull bloodwork at baseline and at 8 weeks minimum. Specifically check LH alongside free T and SHBG – LH is the upstream confirmation that the mechanism is working.

Tier 3 (monitor and decide at 3 months):

• If free T has moved meaningfully by week 12, continue for the full 6 months then run a 4-week washout and retest. Assess whether gains hold or partially revert.
• If free T hasn’t moved at 8–12 weeks, Tongkat ali is probably not a primary responder for you. Stop and redirect the budget to something else.

Tier 4 (don’t bother):

• High-dose Tongkat beyond 400mg daily. The dose-response plateau appears to be around 200–300mg of standardized extract, and higher doses don’t seem to produce proportionally higher effects while increasing GI complaints.
• Any Tongkat ali product that doesn’t specify extract standardization and can’t provide a current certificate of analysis.

What You’re Probably Thinking Right Now

Is this just B-tier because the gains are small? The gains are modest at a good baseline, yes – 60 ng/dL over 6 months for someone starting at 658 is real but not dramatic. For someone starting at 380, the same mechanism produces much larger absolute gains. Ron rates it B-tier partly for this reason: effect size is highly baseline-dependent.

Should I stack Tongkat with boron? I was already running boron when I started this experiment (9mg daily). In my data, Tongkat appeared to add an incremental SHBG-lowering effect beyond what boron was already producing — SHBG went from 39 (post-boron, pre-Tongkat) to 31 (after 6 months of adding Tongkat). Whether they’re additive or partially overlapping mechanisms, I can’t cleanly separate. But they didn’t appear to interfere with each other.

How does this compare to your boron experiment? My boron experiment (Ron covers the mechanism here) produced larger free T gains (10.4 to 18.0 pg/mL over 90 days) from a lower starting point. Tongkat starting from 18.2 baseline free T produced more modest free T gains (to 22.1 pg/mL over 6 months). This isn’t Tongkat being worse — it’s the ceiling effect at a better baseline. The boron work created room; Tongkat pushed further into that room.

What happens when you stop? I haven’t fully tested this. I ran a 4-week washout after the 6-month protocol and total T came back to 680 ng/dL at the 4-week mark – down from 718 but not fully back to 658 baseline. The SHBG was at 34 nmol/L at washout (partial rebound from 31). This suggests the gains are partly Tongkat-dependent and partly sustained by whatever endogenous changes six months of LH stimulation produced. I’ll continue monitoring.

The experiment was worth running. For a compound I’d been skeptical about at my baseline T level, the data showed a real response – particularly in the upstream LH signal and the free T improvement. It’s earned its place in my stack as a conditional B-tier addition, which is exactly where Ron Males had it all along. Sometimes the tier list is just right.