Do weight loss supplements really work?

Do Weight Loss Supplements Really Work?

30 Jun, 2025

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3 min read

Some weight loss supplements may support fat metabolism, appetite control, or nutrient balance, but they’re not magic pills. Sustainable results still come from a calorie deficit, exercise and consistency.

Do weight loss supplements really help with fat loss?

The short answer: they can support your journey, but they’re not the main driver of fat loss.

Fat loss happens when your body uses more energy than it takes in, through food, movement, or a combination of both. However, weight loss supplements may help in three important ways:

Appetite regulation
Energy and metabolism support
Preventing nutrient gaps during calorie restriction

Let’s look at what that really means, and how to use them wisely.

1. Appetite and craving support

Some weight loss supplements include ingredients like green tea extract, glucomannan, or 5-HTP, which may help reduce hunger or delay stomach emptying. ¹

This can make it easier to stick to a reduced-calorie diet, especially in the first few weeks when hunger spikes.

GLP-1 medications like Ozempic, Mounjaro and Wegovy are also designed to suppress appetite, but they can lead to very low calorie intake, sometimes below what’s nutritionally adequate. ²

2. Nutrient deficiencies during weight loss

Whether you're eating less by choice or due to medication, a lower food volume can mean lower vitamin and mineral intake, especially for nutrients like:

Vitamin D (common deficiency, especially in winter)
Vitamin B (often low in plant-based diets and older adults)
Vitamin C (needed for collagen, skin health and iron absorption)

These gaps can slow metabolism, increase fatigue, or affect mood and immunity, making weight loss harder and less sustainable. ³

We recommend a high-absorption multivitamin or targeted support like:

These help maintain metabolic function and immune health, especially when calories are low.

3. Metabolic and energy support

Some supplements can help maintain energy and fat metabolism when your calorie intake drops. Ingredients to look for include:

L-carnitine (involved in fat transport)
Green tea extract (may aid fat oxidation)
Chromium (supports blood sugar regulation)
Magnesium (essential for energy production)

These won’t cause fat loss on their own, but they help you function better while in a calorie deficit, making it easier to train, focus and stay consistent. ⁴

4. What to avoid: Red flags in weight loss supplements

Claims like “melt fat while you sleep” or “burns fat instantly”
Proprietary blends without dosages
Stimulants you can’t tolerate (excess caffeine, synephrine, etc.)
Supplements that replace real meals long-term

Always check for transparent labels, third-party testing and realistic claims. And never skip meals in favour of pills, it can lead to rebound weight gain and worsens nutrient intake.

5. If you're taking GLP-1 weight loss medications

GLP-1 drugs reduce appetite significantly, but this often leads to unintentionally low intake of protein, fibre and key micronutrients. ² That’s why nutritional support is especially important if you're using:

Ozempic
Saxenda
Wegovy
Mounjaro

Supplementing with Vitamin D3, B12, magnesium, and a broad multivitamin can help reduce fatigue, hair thinning, constipation and immunity dips, all side effects that are increasingly reported. ⁵

Shop our multivitamins

Weight loss supplements aren’t quick fixes, but they can support your metabolism, nutrient intake and appetite management during a calorie deficit or GLP-1 treatment. Think of them as a support system, not a replacement for food, movement, or mindset.