Metabolic & Weight
13 products graded for this goal, sorted by strength of evidence.
This is a small, deliberately cautious category. Metabolic and weight-related supplements are among the most oversold in the industry, and the honest evidence base is narrower than the marketing suggests. Berberine is the standout — multiple human trials show meaningful effects on blood glucose and lipid markers, with mechanisms similar to some diabetes medications, though it's not a weight-loss drug and most trials measure metabolic markers rather than pounds lost. Alpha-lipoic acid has moderate evidence for glucose metabolism, mostly in people with existing insulin resistance. Iodine and selenium matter here primarily through thyroid function — genuinely important for metabolic rate, but only correcting a deficiency moves the needle; supplementing beyond adequate levels doesn't speed up metabolism. Sulforaphane has promising but early human data on metabolic markers. Infrared sauna is included for its cardiovascular and possibly metabolic stress-adaptation effects, which is a different category of evidence than a pill. None of this substitutes for the two interventions with by far the strongest weight-management evidence: sustained caloric deficit and resistance or aerobic exercise.
Common questions
Does berberine actually work for weight loss?
The stronger evidence is for blood glucose and lipid markers, not direct weight loss — some trials show modest weight reduction as a secondary effect, likely tied to improved glucose metabolism rather than an appetite or fat-burning mechanism.
Can supplements boost your metabolism?
Meaningfully, only if you're correcting a deficiency — iodine or selenium in someone with impaired thyroid function, for instance. In someone with normal thyroid and nutrient status, no supplement here has strong evidence for raising metabolic rate.
Is berberine a natural alternative to metformin?
They work through some overlapping pathways, and a few head-to-head trials show comparable glucose effects, but berberine hasn't been studied at the scale or duration of metformin. It's not a substitute without medical guidance, especially for anyone already on diabetes medication.
What actually works for sustainable weight loss?
Caloric deficit and consistent exercise remain the best-evidenced levers by a wide margin. The supplements on this page support metabolic health at the margins — they're not a replacement for that foundation.
When the evidence changes, we’ll tell you.
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Medical disclaimer. The information on this site is provided for educational purposes only and is not intended as medical advice. It does not constitute a diagnosis, treatment plan, or recommendation for any specific health condition. Always consult a qualified healthcare professional before making changes to your supplement regimen, diet, or lifestyle — especially if you are pregnant, nursing, taking medications, or managing a medical condition.
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