Ask around about fat burners and you'll hear two stories. One person swears they lost weight. Another says the only thing they got was a racing heart, bad sleep and no change on the scale. Both can be true — and understanding why will save you money and frustration.

First, the uncomfortable truth

No supplement makes fat disappear on its own. Fat loss happens when your body uses more energy than it takes in over weeks and months. In practice, the most common reason people "can't lose weight" isn't a broken metabolism. It's that calories creep back in unnoticed — the odd handful of nuts, the larger portion, the weekend that undoes the week.

So where does a thermogenic formula fit? At its best, it's a small helper: a modest nudge to energy use and fat utilisation, and steadier energy so it's easier to stick with the plan. If a product promises more than that, be suspicious.

What "thermogenic" means

Thermogenesis is the heat your body produces as it burns fuel. Some compounds, chiefly caffeine and green tea catechins, increase that slightly — mainly by keeping noradrenaline, your body's natural "burn fuel" signal, active for longer.

Why most fat burners make people jittery

The jitters people complain about almost always come from one thing: too much stimulant. Many popular fat burners pack 200–300 mg of caffeine per serving — equivalent to two or three strong coffees — and often add other stimulants on top. Stack that with your normal coffee and an afternoon energy drink, and a racing heart, anxiety and broken sleep are predictable. Poor sleep then increases hunger and cravings the next day, working directly against you.

How Green Tea Complex is different

Green Tea Complex was designed as a low-stimulant formula. The thermogenic part is deliberately modest:

  • Green tea extract, for its catechins.
  • Guarana, a natural caffeine source, in a small amount.
  • Willow bark, used traditionally alongside green tea and caffeine.

The rest of the formula is about the machinery that actually burns fat:

  • L-carnitine is the molecule that carries fatty acids into your mitochondria, where they're used for energy.
  • B vitamins (B1, B2, B3, B5) are essential cofactors for turning carbohydrates and fats into energy.
  • Chromium contributes to normal blood sugar levels, which helps with energy dips and cravings.
  • Magnesium, vitamin C, alpha lipoic acid and selenium support normal energy metabolism and antioxidant defences.

The idea is that if you're asking your body to burn more fuel, it should have everything it needs to do so — without overloading your nervous system.

The green tea extract and liver question

You may have seen headlines linking green tea extract to liver damage. They're based on real cases, so it's worth understanding them. The cases involve concentrated extracts delivering large amounts of the catechin EGCG — and European food-safety experts found that 800 mg or more of EGCG a day was associated with signs of liver stress. Risk also appears higher when extracts are taken on an empty stomach or while fasting.

The amount of green tea extract in Green Tea Complex is a small fraction of that level. Even so, we recommend you:

  • Take it with food, never on an empty stomach or during a fast.
  • Don't combine it with other green tea extract products or other fat burners.
  • Stop and see a doctor if you notice dark urine, yellowing of the skin or eyes, pain under the right ribs, or unusual tiredness and nausea.

Getting the best out of it

  • Take it in the morning, with breakfast, so the caffeine doesn't affect your sleep.
  • Count your total caffeine. If you're a heavy coffee drinker, cut back a cup.
  • Use it alongside a plan, not instead of one. A sensible calorie deficit, protein at each meal and regular movement — especially strength training to protect muscle — are what drive results.
  • Give it time. Judge progress over 8–12 weeks, by waist measurement and how clothes fit as well as the scale.

Breaking a plateau

If you've stalled, check the basics before reaching for another product: track everything you eat honestly for two weeks, including drinks and weekends; make sure you're sleeping at least seven hours; and remember that as you get lighter, you need fewer calories, so what worked at the start may need adjusting.

Safety: Not for anyone under 18, pregnant or breastfeeding. Avoid if you have liver disease, heart rhythm problems, uncontrolled high blood pressure, an anxiety disorder or a stomach ulcer. Willow bark is related to aspirin: don't take Green Tea Complex if you're allergic to aspirin, or take blood thinners, aspirin or anti-inflammatories, unless your doctor agrees. If you have a history of disordered eating, please speak to a health professional before using any weight-loss product.

This medicine has not been evaluated by SAHPRA. It is not intended to diagnose, treat, cure or prevent any disease.