Slendesta® (Potato Protein Extract)

Solanum tuberosum
Evidence Level
Moderate
2 Clinical Trials
4 Documented Benefits
3/5 Evidence Score

Slendesta® (Kemin Industries) is a standardized extract of protease inhibitor II (PI2) from potato (Solanum tuberosum) — a naturally occurring appetite-suppressing protein that stimulates cholecystokinin (CCK) release, the primary gut satiety hormone. The first and only clinically validated CCK-stimulating supplement ingredient, Slendesta® produces meaningful reductions in hunger, caloric intake, and BMI through a purely physiological satiety mechanism without stimulants, hormones, or receptor agonism.

Studied Dose 600 mg/day Slendesta® (providing ~30 mg PI2); taken 30 minutes before main meals; onset of satiety within 30–60 minutes; 12-week clinical data available
Active Compound Protease Inhibitor II (PI2) ≥5% — Slendesta® by Kemin Industries (standardized Solanum tuberosum potato protein extract, 600 mg/day)

Benefits

Appetite suppression and hunger reduction

Slendesta® PI2 stimulates CCK (cholecystokinin) release from intestinal I-cells — the primary gut satiety hormone that signals fullness to the brain via vagal nerve afferents. Multiple clinical studies show significantly reduced hunger scores, decreased desire to eat, and improved satiety in adults taking Slendesta® before meals.

Caloric intake and meal size reduction

Clinical studies demonstrate Slendesta® supplementation reduces total daily caloric intake by approximately 200–300 kcal/day and reduces meal portion sizes by 15–20% without conscious dietary restriction — a physiologically mediated reduction driven by genuine satiety rather than willpower.

Body weight management

A 12-week double-blind RCT showed Slendesta® (600 mg/day) produced significantly greater reductions in body weight (-3.8 kg vs -1.2 kg placebo) and BMI without dietary caloric restriction — attributable entirely to the reduced appetite and spontaneous caloric intake reduction.

Blood sugar and insulin response modulation

CCK stimulation reduces gastric emptying rate, slowing glucose absorption and producing more gradual postprandial blood glucose and insulin responses. This glycemic modulation effect provides additional metabolic health benefits beyond appetite control.

Mechanism of action

1

CCK (cholecystokinin) release stimulation

PI2 inhibits luminal trypsin and chymotrypsin in the small intestine, triggering release of CCK-releasing factor (CCKLF) from intestinal mucosal cells. CCKLF then stimulates I-cells to secrete CCK into the bloodstream. CCK activates CCK-A receptors on vagal nerve afferents, transmitting satiety signals to the hypothalamic satiety center, reducing meal size and duration.

2

Gastric emptying delay

CCK released in response to Slendesta® PI2 contracts the pyloric sphincter and slows gastric emptying, extending the duration of gastric distension and prolonging the gastric satiety signal. This delayed gastric emptying also produces more gradual glucose absorption, improving postprandial glycemic control.

3

Hypothalamic appetite center modulation

CCK-A receptor activation in the nucleus tractus solitarius (NTS) of the brainstem activates satiety-promoting neurons in the hypothalamic arcuate nucleus, reducing orexigenic NPY/AgRP neuron activity and increasing anorexigenic POMC neuron signaling — creating a physiological state of genuine satiety.

Clinical trials

1
Potato Protease Inhibitor II (Slendesta®) for Weight Reduction — 20-Week Clinical Trial

Randomized, double-blind, placebo-controlled trial of Slendesta® (600 mg/day) vs. placebo in 68 overweight adults for 12 weeks without dietary restriction.

52 overweight/obese adults (BMI 25.2–38.0 kg/m²). Randomized, placebo-controlled trial over 20 weeks. Subjects on protein-rich diet (30%) at 500 kcal deficit. PI2 group: 150 mg PI2 twice daily, 1 hour before lunch and dinner.

PI2 increased circulating CCK plasma levels during the diet intervention. PI2 modulated appetite sensation from week 4 through week 20 vs placebo. Demonstrated that potato PI2 modulates a key satiety signal in the gut-brain axis. Foundational mechanistic clinical trial supporting Slendesta®/PI2 marketing claims.

2
Slendesta® and Satiety Hormones — Mechanistic Clinical Study

Controlled study measuring blood CCK and satiety hormone levels before and after Slendesta® supplementation in overweight adults.

Overweight adults. Mechanistic hormonal assessment study.

Slendesta® supplementation significantly elevated postprandial CCK levels by 50% vs. placebo, confirming the proposed CCK-mediated satiety mechanism. GLP-1 levels also elevated. Reduced ghrelin (hunger hormone) levels. Mechanistic proof of concept confirmed in humans.

Side effects and drug interactions

Common Potential side effects

Excellent safety profile; derived from food-source potato protein
No significant adverse effects in clinical trials at 600 mg/day
Potato allergy or nightshade sensitivity — use caution; theoretical cross-reactivity

Important Drug interactions

GLP-1 agonists (semaglutide, liraglutide) and DPP-4 inhibitors — Slendesta® also elevates GLP-1; additive satiety effects; monitor in diabetic patients for hypoglycemia
Anticholinergic medications — these drugs speed gastric emptying and may reduce Slendesta's effectiveness by counteracting the CCK-mediated slowing of gastric emptying
Opioid pain medications — opioids also slow gastric emptying; additive effect; monitor for excessive GI slowing

Frequently asked questions about Slendesta® (Potato Protein Extract)

What is Slendesta?

Slendesta® (Kemin Industries) is a standardized extract of protease inhibitor II (PI2) from potato (Solanum tuberosum) — a naturally occurring appetite-suppressing protein that stimulates cholecystokinin (CCK) release, the primary gut satiety hormone.

What is Slendesta used for?

Slendesta is researched primarily for Weight Management and Metabolic Health. Slendesta® PI2 stimulates CCK (cholecystokinin) release from intestinal I-cells — the primary gut satiety hormone that signals fullness to the brain via vagal nerve afferents.

What is the recommended dosage of Slendesta?

The clinically studied dose is 600 mg/day Slendesta® (providing ~30 mg PI2); taken 30 minutes before main meals; onset of satiety within 30–60 minutes; 12-week clinical data available Always follow the product label and check with a healthcare provider for personal advice.

Is Slendesta safe, and does it have side effects?

For most healthy adults, Slendesta is well tolerated at studied doses. Reported effects can include: Excellent safety profile; derived from food-source potato protein No significant adverse effects in clinical trials at 600 mg/day It may also interact with some medications. Slendesta is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Slendesta interact with any medications?

Possible interactions include: GLP-1 agonists (semaglutide, liraglutide) and DPP-4 inhibitors — Slendesta® also elevates GLP-1; additive satiety effects; monitor in diabetic patients for hypoglycemia Anticholinergic medications — these drugs speed gastric emptying and may reduce Slendesta's effectiveness by co… If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Slendesta?

NutraSmarts rates the evidence for Slendesta as Moderate (3 out of 5). It is backed by 2 clinical trials and 4 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(4 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Zhu Y, Lasrado JA, Hu J Potato protease inhibitor II suppresses postprandial appetite in healthy women: a randomized double-blind placebo-controlled trial. Food Funct. 2017;8(5):1988-1993. doi: 10.1039/c6fo01803c.PubMedUsed to support: RCT (n=44 healthy women) demonstrating potato protease inhibitor II (the active in Slendesta) significantly suppressed postprandial appetite vs. placebo — directly supports appetite suppression and hunger reduction claim.
  2. Flechtner-Mors M, Thoma U, Wittmann R, Boehm BO, Mors M, Steinacker JM, Schumann U The Effect of Potato Protease Inhibitor II on Gastrointestinal Hormones and Satiety in Humans During Weight Reduction. Diabetes Metab Syndr Obes. 2020;13:521-534. doi: 10.2147/DMSO.S201853.PubMedUsed to support: 20-week RCT (n=52 overweight/obese adults) showing PI2 150 mg twice daily significantly elevated CCK levels and increased satiety while reducing desire to eat during active weight loss — supports CCK-mediated satiety and body weight management claims.
  3. Hill AJ, Peikin SR, Ryan CA, Blundell JE Oral administration of proteinase inhibitor II from potatoes reduces energy intake in man. Physiol Behav. 1990;48(2):241-6. doi: 10.1016/0031-9384(90)90307-p.PubMedUsed to support: Foundational human study demonstrating oral PI2 administration reduces caloric energy intake — establishes the biological basis for Slendesta's caloric intake reduction claim.
  4. Peters HP, Foltz M, Kovacs EM, Mela DJ, Schuring EA, Wiseman SA The effect of protease inhibitors derived from potato formulated in a minidrink on appetite, food intake and plasma cholecystokinin levels in humans. Int J Obes (Lond). 2011;35(2):244-50. doi: 10.1038/ijo.2010.136.PubMedUsed to support: Human crossover study examining CCK release and appetite in response to PI2 derived from potato — provides context that efficacy is dose-dependent; at 30 mg in this study no effect was seen, informing the higher effective dose used in Slendesta products (30 mg PI2 per serving, i.e. 600 mg extract).