Weight & Metabolism
Supplements for weight management and everyday metabolism: glucomannan, chromium, B vitamins and protein. We explain which forms deliver a usable dose, the conditions behind the glucomannan claim and how to use them.Read more →
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Metabolism support and weight management: what the nutrients actually do
Your metabolism is the sum of the chemical processes that turn food into energy. No capsule speeds that up on command. What a supplement can do is supply nutrients those processes depend on, and make a calorie-controlled diet easier to keep up. This collection sits within MOVE + RECOVER, our pillar for sport and recovery, because eating less and training well are usually the same project.
What may be promised here, and what may not
In Europe, one supplement ingredient carries an approved weight-loss claim: glucomannan from konjac root, a soluble fibre. The wording is narrow. Glucomannan, in the context of a calorie-restricted diet, contributes to weight loss, and only at 3 g a day, split into three 1 g doses with one to two glasses of water before meals. Without the diet, the claim no longer applies. The rest of this category works on metabolism, not the scales. Chromium contributes to normal macronutrient metabolism and to the maintenance of normal blood sugar levels. B vitamins such as B2, B6 and B12 contribute to normal energy-yielding metabolism and to the reduction of fatigue and tiredness. Iodine contributes to normal thyroid function.
How we select for this collection
We look at three things: the form, the dose, and whether a combination makes sense. With glucomannan the dose is set for you, so we favour powders and capsules that deliver a full 1 g per serving over 500 mg capsules that ask you to swallow six a day. For chromium we prefer picolinate and yeast-bound forms, which dissolve and absorb more readily than chromium chloride. We leave out stacked blends that hide the amount per ingredient behind a proprietary mix, because you cannot check whether the dose does anything. Read how we select brands and products.
Who this collection suits
- People in a calorie deficit who struggle with hunger between meals and want a fibre that works before eating, not after.
- People eating noticeably less than usual, where a multivitamin or a B-complex covers the nutrients a smaller plate no longer delivers.
- People training while cutting, where protein powders and shakes help you reach a daily protein intake. Proteins contribute to the maintenance of muscle mass.
Honest expectations
Fullness from fibre is something you notice within days, or not at all: it depends on the meal and on the water you drink with it. Nutrient-related effects, such as less fatigue when your B vitamin intake was low, need two to three weeks of consistent use before you can judge them. Nothing here replaces the calorie deficit, and nothing here undoes one.
Two practical points. Glucomannan swells strongly in water, so take it with a full glass and never dry. It is not suitable if you have difficulty swallowing. And if you use prescription medicines, ask your pharmacist about the timing between them and any fibre supplement, because a viscous gel in the stomach can slow down how quickly other things are absorbed.
Frequently asked questions
They are two different groups sold under one heading. The first group works in the digestive tract, mainly soluble fibres that take up space and slow down stomach emptying. The second group supplies nutrients your body uses to release energy from food, such as B vitamins, chromium and iodine. Neither group is a treatment for weight. They are additions to a diet and activity pattern that already exists, and they only make sense alongside it.
