5 Supplements for Weight Loss a Dietitian Recommends

As a Registered Dietitian who specializes in weight loss, I see the direct benefits of adding supplements to a whole-food diet for supporting someone’s weight-loss journey. After years of working with women on metabolic health and weight loss, and after going through my own 60-lb weight-loss journey, I often use and recommend several well-researched supplements. These are the ones I actually take and why I take them. 

Let’s start with one of my favorites, Alpha-Lipoic Acid (ALA). This is one of my top recommendations as it is a naturally occurring antioxidant, found in small amounts in spinach, broccoli, and organ meats. Three separate meta-analyses of randomized controlled trials have confirmed the same finding: ALA produces statistically significant weight loss compared with placebo. One 24-week double-blind trial using 600 mg/day of R-ALA (the more bioactive form) showed that women lost about 5% of their body weight without changes in diet or exercise. A 2025 meta-analysis of 63 RCTs confirmed it significantly reduces insulin resistance, fasting glucose, fat mass, waist circumference, and triglycerides. ALA works by activating AMPK, the same cellular energy sensor that exercise and metformin activate. This may enhance fatty acid oxidation and improve glucose uptake into skeletal muscle. It also helps suppress fat production in the liver ^(1-8). 

Dihydroberberine is next; you’ve likely heard it described as nature’s metformin. The nickname is earned as berberine acts on many of the same pathways as the prescription drug, and the clinical data backs this up. A 2025 meta-analysis of 23 RCTs found it significantly reduced body weight, BMI, waist circumference, fasting glucose, fasting insulin, and HOMA-IR. A separate meta-analysis of 20 RCTs (1,761 participants) showed it lowered fasting glucose by 0.52 mmol/L, HbA1c by 4.48 mmol/mol, fasting insulin by 2.36 mU/L, and HOMA-IR by 0.85. Dihydroberberine is the reduced form that has better oral absorption than standard berberine. Those last two numbers, fasting insulin and HOMA-IR,  are the ones I care most about for my clients. That’s not just “lower blood sugar.” That’s your body becoming measurably more insulin-sensitive, which changes the entire fat-storage equation. Another interesting fact about berberine is that it actively reshapes your gut microbiome by promoting butyrate-producing bacteria that strengthen your intestinal barrier ^(8-14).

Cinnamon Extract is the third supplement that is worth considering in a weight-loss stack. This is not the same cinnamon found in your cabinet; it is water-extracted Ceylon cinnamon, processed to remove coumarin (the compound in common Cassia cinnamon that can be hard on the liver at high doses). The data here is genuinely impressive. A 2025 meta-analysis of 28 RCTs in over 3,000 participants found cinnamon reduced fasting blood glucose by over 15 mg/dL, post-meal glucose spikes by nearly 40 mg/dL, and HbA1c by 0.56%. A separate meta-analysis found it also reduced body weight, BMI, waist circumference, and fat mass, with the strongest effects at 2+ grams daily for at least 12 weeks. Cinnamon inhibits the enzymes that break down starches, slowing carb absorption and blunting the insulin surge. This is a great add for women already eating low-carb but still seeing glucose spikes ^(15-17). 

Chromium Picolinate is the one that tends to surprise people. While the weight-loss data is modest, the research on cravings is worth diving into. A double-blind placebo-controlled trial in overweight women with carb cravings found that 1,000 mcg of chromium picolinate significantly reduced food intake, hunger, and fat cravings compared to placebo. It’s thought that, because it acts on insulin receptor signaling and the serotonin and dopamine pathways, it helps reduce the desire to overeat. This one can be particularly helpful if you’re finding yourself always heading to the fridge at night ^(18-21). 

Lastly, let’s go over myo-inositol. This one is so helpful for ladies with PCOS or anyone dealing with hormonal weight gain tied to insulin resistance. Inositol is a B-vitamin family member that acts as a second messenger in insulin signaling. In women with PCOS, there’s often a deficiency in inositol availability in tissues, which contributes directly to the insulin resistance that makes weight loss feel impossible no matter what you eat. A 2025 umbrella review of 13 meta-analyses found it significantly improved HOMA-IR, fasting insulin, triglycerides, and hormonal parameters in women with PCOS. Myo-inositol lowers HOMA-IR, lowers fasting insulin, lowers triglycerides, and helps normalize testosterone, SHBG, AMH, and free androgen index ^(22-24). 

Supplements can be powerful additions to a weight-loss diet, especially when you understand that supplements can change the environment that your metabolism lives in. You can increase your insulin sensitivity, achieve steadier blood sugar, reduce inflammation, curb cravings, and improve your hormonal signaling. When you have all of these things working in your favor. I take all five of these. Not because I’m hoping for a shortcut, I lost 60 lbs the hard way, and I know there isn’t one, but because after years of working with women on their metabolic health, and going through my own journey, I’ve come to see these as legitimate tools that support the bigger picture.

References

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