TikTok user Dave says he used to be overweight and a "food addict" before shedding over 20 kilograms, without exercise.
Now he shares weight loss tips with 400,000 followers, touching on topics like carbohydrate intake, intermittent fasting and the best herbs and foods to eat for weight loss.
In one recent video, Dave claims sipping on a special four-ingredient tea before bed is one of the best ways to boost your body's fat burn. As a bonus, he says it helps him sleep "like a baby".
"This drink contains four powerful ingredients that when taken together helps boost your metabolism, increase fat burning hormones, decrease fat producing hormones and help you sleep deeply," he says in the clip.
"It will also help with your overall anxiety and stress levels."
The first ingredient is around 250ml of warm water - about a standard cup.
"The second ingredient is chamomile tea," instructs Dave.
"Chamomile tea is a natural relaxant, not only does it reduce stress but it calms your nervous system, relaxes your muscles, and also contains an antioxidant known as apigenin which lowers your cortisol levels and speeds up metabolism.
"The third ingredient is 1-2 tablespoons of lemon. Lemon helps detoxify your blood and liver and helps your body dispel toxins. This helps cleanse your body and allows your metabolism to work at an increased level.
"The fourth ingredient is 1-2 tablespoons of organic apple cider vinegar - this will lower your blood sugar levels, decrease insulin, improve metabolism, help with fat burning and reduce your appetite."
Dave says the tea causes your body to kick into fat-burning mode while you sleep.
But of course, it's worth taking this advice with a solid grain of salt. While he classes himself as a 'health expert', Dave has no medical qualifications to speak of.
As this 'tea' has no harmful ingredients, it's probably safe to give it a go, but consult a medical professional if you have any concerns.