Lean Fast Weight Loss Stack - Clenbuterol + Yohimbine + Ketotifen - 4 weeks

Lean Fast Stack Dosage and Details

The Lean Fast stack — 80 mcg Clenbuterol, 10 mg Yohimbine, and 1 mg Ketotifen — is a classic (and guaranteed effective) cutting and fat-loss combo that's been floating around bodybuilding circles for years. 

Clenbuterol (80 mcg/day)

A potent β2-agonist. It ramps up metabolism (often cited as +10–20% or more in resting energy expenditure), promotes lipolysis (fat breakdown), has some anti-catabolic/muscle-sparing effects, and suppresses appetite. 80 mcg is solidly in the "intermediate/advanced" range for bodybuilding use—typical cycles start at 20–40 mcg and ramp up to 80–120 mcg. It's way above therapeutic asthma doses (20–40 mcg/day).

Ketotifen (1 mg/day, usually at night)

An antihistamine/mast cell stabilizer. Clen causes rapid downregulation of β2-receptors (tolerance hits hard after ~2 weeks, effects drop off). Ketotifen upregulates those receptors somewhat, letting people run clen continuously for 4–8 weeks instead of 2 weeks on/2 off. 1 mg is the standard dose in these protocols.

Yohimbine (10 mg/day)

An α2-adrenergic antagonist. It helps target "stubborn" fat areas (lower abs, love handles, thighs) by blocking receptors that inhibit fat release there. It synergizes with clen by hitting different pathways (clen is mostly β2, yohimbine α2 blockade). 10 mg is moderate-high; many start at 5–7.5 mg to test tolerance because it can spike anxiety, blood pressure, and heart rate.

What’s in this stack?

This bundle comes with everything you need to run this stack for a full month (4 weeks), which is more than enough to see positive results and get a leaner, less bloated, more fit physique:

• x1 Novo-Pharm Clenbuterol 50 mcg/30 tabs
• x1 Novo-Pharm Ketotifen 1 mg/60 tabs
• x1 Novo-Pharm Yohimbine 5 mg/30 tabs

This combo is proven to be extremely effective for short-term weight loss — especially when calories are low and cardio is high.

Clen + yohimbine hits both systemic and localized fat mobilization, and ketotifen extends the clenbuterol window. Many users report noticeable drops in body fat % over 3-4 weeks, with better vascularity and hardness as a cherry on top.

It's not magic: diet is still important. Without a deficit, it'll mostly just make you feel wired/jittery.

How to Take

Got it—switching gears to a clean 6-week continuous run at your target doses:

• Clenbuterol: 80 mcg/day (steady from day 1, assuming you've ramped/tested tolerance before; if not, start lower for 3–5 days and build to 80 mcg)
• Yohimbine: 10 mg/day (ideally split: 5 mg fasted AM + 5 mg pre-cardio/empty stomach for best stubborn fat targeting and to cut anxiety spikes)
• Ketotifen: 1 mg/night (at bedtime to counter clen tolerance and keep the run effective without forced breaks)

This is a solid, aggressive 6-week cutter—common in bodybuilding for pre-contest or final shred phases. With ketotifen onboard from day 1, you avoid the classic 2-on/2-off pattern and get near-continuous thermogenic/lipolytic action. Many users report the stack shines hardest in weeks 3–6 once the body adapts a bit to the stim load.

4-6-Week Weight Loss Plan

Lean Fast Weight Loss Stack Side Effects

All three compounds in this stack are stimulants/sympathetic activators, so they compound each other.

Common/moderate sides:

• Jitters, shaking, cramps (clenbuterol especially — but taurine/potassium supplements help you avoid it);
• Insomnia, sweating, heat intolerance;
• Anxiety (yohimbine is notorious for this; take on empty stomach pre-cardio if possible to make it more comfortable);
• Elevated heart rate;
• Higher BP;
• Potentially mild headaches, nausea.

If you have any pre-existing heart/BP/thyroid issues, this stack is not for you. If you don’t, however, this is one of the absolute best old-school weight loss compounds stacks on the market in 2026. 

Stack & Cycle Recommendations

Here’s what you may need to know before you start:

1. Start lower (40-60 mcg clenbuterol, 5 mg yohimbine) to assess tolerance;
2. Monitor resting HR/BP daily;
3. Supplement taurine (3-5 g/day), potassium, electrolytes;
4. Cycle properly (e.g., 4 weeks on — break — if needed, 4 more weeks). 

In case you need extra guidance, the Muscle Gear Team is always ready to provide a consultation: just message our IFBB Pro and ask anything you need to know regarding this stack.