Jacked Factory Lean PM Review (2026): The Stim-Free Nighttime

Why you should trust this review

I bought this bottle of Lean PM with my own money and took it for eight weeks before writing this. Jacked Factory did not send it and had no idea I was tracking how it affected my sleep and how it fit alongside a morning pre-workout. That matters because supplement claims, especially fat-burner claims, deserve skepticism, and the only honest thing I can report is how it actually felt to use over weeks: the sleep effect, the stim-free stacking, and the label transparency, without pretending a capsule melts fat on its own. So that is exactly what I am reporting.

Across those eight weeks I took it in the evening as directed, while training and dieting normally. Everything below reflects real use, including the honest limitations of the category and the practical fact that the sleep ingredients lock it to nighttime only.

How we evaluated

I took Lean PM nightly for eight weeks as directed, alongside normal training and a sensible diet, since no supplement works in isolation. I tracked how the melatonin and 5-HTP affected my sleep onset and quality, tested whether the zero-caffeine formula genuinely stacked without issue alongside a stimulant pre-workout in the mornings, and read the full label to confirm every ingredient dose was disclosed rather than buried in a proprietary blend. I assessed capsule quality and how the formula sat in the evening. This is honest, real-world use over weeks, not a clinical trial, and I make no medical claims.

Genuinely stim-free, which is the whole point

The defining feature is that this contains zero caffeine and zero stimulants, and that is its real value. Most fat burners are caffeine bombs you cannot take after noon without wrecking your sleep, which makes them useless for evening dosing and impossible to stack with a stimulant pre-workout. Lean PM solves that: over eight weeks I took my normal caffeinated pre-workout in the morning and Lean PM at night with no stimulant overlap, no jitters, no stacked-caffeine crash. For anyone who already uses a stim pre-workout and wants a separate evening product, the stim-free formula is what makes that possible. It is genuinely evening-safe, and that single design choice is the reason the product exists and the reason it works in a real routine.

The sleep support actually does something

The sleep-aid side is more than a label gimmick. The formula includes 3mg of melatonin and 100mg of 5-HTP, and over eight weeks I noticed it consistently helped me fall asleep faster in the evening. Melatonin supports sleep onset and 5-HTP is included to support relaxation, and together they gave the capsules a real settling effect at night. For people who diet and find that hunger or stress disrupts sleep, that support is a meaningful side benefit, since sleep itself matters for recovery and managing appetite. I am careful not to overstate it, this is a supplement, not a sleeping pill, but the sleep effect was noticeable and consistent rather than imagined.

The transparent label and the rest of the stack

One thing I genuinely respect is the fully transparent label. Every ingredient and its exact dose is disclosed, with no proprietary blends hiding how much of anything you are actually getting, which is sadly rare in this category and lets you judge the formula on its merits. Beyond the sleep ingredients, the stack includes 200mg of KSM-66 ashwagandha to support cortisol management and a small dose of green tea extract for metabolic support without stimulation. These are sensible, evidence-aware inclusions at disclosed doses. The capsules themselves were good quality and easy to take. For a buyer who wants to know exactly what is in their supplement, the transparency is a real selling point and builds trust the proprietary-blend competitors do not earn.

The honest limitations

Be clear-eyed about a few things. First, the melatonin and 5-HTP disqualify daytime use entirely; this is a nighttime-only product, and you cannot repurpose it for a morning dose, so it serves one specific slot in your day. Second, individual response varies, as it does with any supplement of this kind, both for the sleep effect and for whatever metabolic support you hope to get, and a fat burner only matters in the context of a real diet and training, never on its own. Third, the stock capsule may be too sedating for some users, so a few people might want to take it earlier in the evening or assess their tolerance first. I make no medical claims here, and anyone on medication or with health concerns should consult a doctor before using melatonin-containing products. These are honest boundaries, not dealbreakers, for the right user.

Who should buy Jacked Factory Lean PM?

Buy it if: you want a stim-free evening supplement you can stack with a morning pre-workout, you value sleep support as part of a cutting routine, and you want a fully transparent label with no proprietary blends. It suits disciplined users who already train and diet and want an evening-safe addition.

Skip it if: you want a daytime energy-and-thermogenic product, since the sleep ingredients rule that out, you are sensitive to melatonin, or you expect a supplement to do the work without diet and training. In those cases a stimulant daytime product or no supplement at all makes more sense.

The verdict

After eight weeks, Jacked Factory Lean PM is a sensible stim-free nighttime supplement for the right user. Its zero-caffeine formula genuinely stacks with a morning pre-workout, the melatonin and 5-HTP gave a consistent sleep-onset benefit, and the fully transparent label is a real point of trust in a murky category. The honest limits are that the sleep ingredients lock it to evenings, individual response varies, and it only matters alongside real diet and training. For a disciplined evening user who wants sleep support and label transparency, it is a reasonable, honestly formulated pick.