A medical food liquid formula to support appetite control, reduce the impact of meals & promote fat loss while preserving lean muscle mass.
Suppresses appetite for hours after meals
Support weight loss without restrictive diets
Reduces cravings and snacking between meals
Slows carb & fat absorption, works locally in the gut
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Carb Fence is designed for the dietary management of impaired carbohydrate metabolism. When your body struggles to keep blood sugar in a healthy range after eating carbs.
It may be relevant if you:
Feel hungry again shortly after eating
Experience cravings or snack between meals
Notice energy dips after meals
Want support with weight management, including fat loss while maintaining lean muscle mass
Carb Fence works locally in the gut and is designed to be used with meals as part of a balanced routine.
Use under the supervision of a healthcare professional.
The Starter Pack is 9 sachets, enough for 3 days. A simple way to try Carb Fence with your meals and see how it works for you.
Many users report feeling fuller after meals and less urge to snack within the first few days.
The Weekly Box is 21 sachets (1 week). One-time purchase. No subscription.
The Monthly Supply is 84 sachets (1 month) with a subscribe and save option. Designed for consistent use over time, with better value per sachet.
Take one sachet at the start of each meal, up to three times daily. Squeeze directly into your mouth and consume immediately. Drink an additional glass of water with your meal.
Do not store open sachets. No refrigeration needed.
Consistency is key for sustained appetite control and metabolic support. Carb Fence works by slowing how quickly your body breaks down carbohydrates and fats. Many users notice they feel fuller for longer and snack less within the first week.
Ships from our warehouse in the United States. Standard delivery is 3–4 business days. Express shipping is available for 1–2 day delivery.
Rated 4.7 / 5.0 by 20,000+ reviews
Thousands Lost Weight, Read Their Stories
Join 20,000+ customers who've taken control of their energy and appetite.
Anita P. Verified Customer
Rated 5.0 / 5.0
‘’I’ve struggled with my appetite for a while and felt like I was always thinking about food. I’d eat lunch and then be back at the snack drawer a couple of hours later. I started taking Carb Fence with meals a few weeks ago and I’ve noticed I stay satisfied much longer now. I still eat normally, but I don’t feel that constant urge to snack anymore. I’ve also started noticing my clothes fitting a little better.’’
More satisfied after meals
Clothes fit better
Mia S. Verified Customer
Rated 5.0 / 5.0
"I've been prediabetic for two years and tried everything to control my appetite. I'd eat lunch and be starving again within two hours, constantly snacking and gaining weight. Three weeks using this and I'm genuinely shocked. I take it with meals and I'm satisfied for hours. No cravings, no constant hunger. I've lost 8 pounds without changing what I eat."
Appetite finally controlled
Lost 8 pounds naturally
Sydney S. Verified Customer
Rated 5.0 / 5.0
"I was constantly fighting hunger all day long. I'd eat a full meal and two hours later I'd be raiding the fridge again. My blood sugar was all over the place and my doctor warned me about prediabetes. I started using Carb Fence with each meal and the difference was immediate. I actually stay full now. I've lost 12 pounds in six weeks and my energy is so much better."
Hunger under control
Down 12 pounds in 6 weeks
Megan D. Verified Customer
Rated 5.0 / 5.0
"After trying every diet under the sun, nothing stuck. I'd lose a few pounds then gain it right back because I couldn't control my appetite. A friend told me about Carb Fence and I figured why not. I've been taking it for two months now and I'm down 15 pounds. But the best part is I'm not hungry all the time anymore. I can eat normally and actually feel satisfied. No more constant snacking. No more obsessing over food. This has been life-changing for me."
Hunger suppressed
Lost 15 lbs
carb fence
A Medical Food. Designed for Sustainable Weight Loss
A Medical Food. Designed for Sustainable Weight Loss
Carb Fence works locally in the gut to reduce the impact of carbohydrates and fats during digestion, helping support:
Powerful Appetite Suppression
Satisfied for hours
Stop constant snacking
Sustainable Weight Loss
Lose fat, keep muscle
See results in weeks
Stable Blood Sugar Control
Flatten post-meal spikes
No afternoon energy crashes
Safe & Non-Systemic
Works in gut only
Well tolerated
Sustainable Weight Loss
Lose fat, keep muscle
See results in weeks
THE PROBLEM
Why You Can't Lose Weight, No Matter How Hard You Try
It's not willpower. Modern meals, fast food, processed carbs etc. are engineered to be absorbed faster than any meal humans have ever eaten. When digestion is that fast, blood sugar spikes. Then it crashes. Then you're hungry again. Then you eat. And the cycle runs your day. You've been fighting the symptom: the hunger. The real problem is the speed. Carb Fence slows the speed.
Patented SiPore® Technology
The Science Behind Lasting Fullness
SiPore® slows carb and fat digestion in your gut, promoting a steadier response in blood sugar, instead of spiking.
SiPore® slows carb and fat digestion in your gut - so you feel fuller for longer and break the cycle of constant hunger & snacking.
This means you stay energised for hours after eating. Cravings disappear. Snacking between meals stops naturally. Weight management becomes easier.
What users of SiPore® users report when digestion slows
Blood Sugar Stays stable after meals, no sharp spike and sudden crash.
Energy Feel full for longer after eating. Less urge to snack between meals.
Weight Promotes fat loss without loss of muscle mass
Appetite Eat less naturally. Less need for strict dieting.
SiPore® works locally in your gut during digestion. It does not enter the bloodstream and is designed to reduce the impact of the food you eat.
what’s inside
One Active Ingredient.
Pure SiPore® silica, a natural mineral, precisely engineered to work during digestion.
Patented SiPore® tech
A Mineral naturally found in food
but does it actually work?
Most Participants Lost Weight in Just 4 Weeks
Among responders, average weight loss was 4.2 lbs Results from a real-world study with 80 Americans showing the effectiveness of CarbFence™
Among responders, average weight loss was 4.2 lbs Results from a real-world study with 80 Americans showing the effectiveness of CarbFence™
U.S. Real-World Evidence Study, 2025 (N=80)
62% of participants lost weight
Responders lost 4.2 lbs on average
CarbFence™ showed an immediate impact on appetite and cravings, resulting in meaningful weight loss without loss of muscle mass. Participants demonstrated excellent tolerability, high daily compliance, and no serious adverse events.
Daily compliance 95%
No serious adverse events were reported by participants
Hunger reduction 19%
Snacking reduction 30%
Sugar cravings 25%
Food coma fatigue 24%
All of these are statistically significant results.
Participants lost weight 62%
Average weight reduction 4.2 lbs
Weight loss was achieved while preserving lean body mass, supporting healthy body composition
Improved clothing fit +50%
CarbFence™ showed an immediate impact on appetite and cravings, resulting in meaningful weight loss without loss of muscle mass. Participants demonstrated excellent tolerability, high daily compliance, and no serious adverse events.
62% of participants lost weight
Responders lost 4.2 lbs on average
Rated 4.7 / 5.0 by 20,000+ customers
Why Americans Choose SIGRID
See why thousands of Americans are choosing Carb Fence for a more natural, sustainable approach to weight management.
What to Expect
How SiPore® Works Over Time
Immediate appetite suppression that compounds into visible fat loss.
First Meal
WEEK 1
Week 4
3 Months
First Meal
Works from your very first meal. Slows the breakdown of carbs and fats, so you feel fuller and more satisfied after eating.
Less urge to snack
Feel fuller after meals
WEEK 1
You start eating less without thinking about it. Hunger between meals fades as you stay fuller for longer.
Reduced caloric impact from meals
Prolonged energy after eating
Week 4
Changes become visible. Many report improved clothing fit.
Weight loss from body fat
Maintaining muscle mass
3 Months
The effect compounds into lasting results. Consistently reduced intake and improved metabolism support meaningful changes in body composition.
Reduction in body fat percentage
Sustainable weight management
FAQS
Frequently asked questions
Carb Fence uses patented SiPore® technology to work locally in your gut. It entraps digestive enzymes (alpha-amylase and lipase) that break down carbs and fats, helping slow how quickly your meal is processed.
This leads to a more gradual release of energy after eating, supporting a steadier post-meal experience. SiPore® does not enter the bloodstream and passes through the body naturally.
No serious side effects have been reported in clinical studies. SiPore® has been extensively evaluated and is generally well tolerated. It works locally in the gut and does not enter the bloodstream, which contributes to its gentle profile.
Carb Fence can generally be taken alongside other medications or supplements, but timing matters. Because SiPore® works locally in the gut, take Carb Fence at least 2 hours before or after any other orally administered medication or supplement to avoid potential interactions in the digestive tract. Consult your healthcare provider before starting Carb Fence.
Both products use patented SiPore® technology and are designed to work locally in the gut during digestion. However, they are intended for different uses and fit into different types of routines.
Carb Fence™ is a medical food in liquid form intended for the dietary management of impaired carbohydrate metabolism (when your body struggles to keep blood sugar in a healthy range after eating carbs) under the supervision of a healthcare professional. It delivers a higher amount of SiPore® per meal and is designed to provide more active meal-based support for appetite control, cravings, and weight management.
Glucose Stabilizer is a dietary supplement in capsule form designed for everyday metabolic support. It provides a lower daily dose of SiPore® and is typically taken twice daily to help support steadier post-meal glucose responses, fewer energy dips after meals, and a reduced urge to snack.
In short: Carb Fence™ is a medical food designed for more targeted meal-based support, while Glucose Stabilizer is a dietary supplement intended for everyday wellness support.
Carb Fence works from your very first meal. Most users notice increased satiety and reduced appetite between meals starting on day one. Visible weight changes typically appear within the first 4 weeks. For sustained fat loss and metabolic improvements, we recommend consistent use for at least 3 months.
Carb Fence can be used up to three times daily as part of a long-term routine. It is designed for the dietary management of impaired carbohydrate metabolism (when your body struggles to keep blood sugar in a healthy range after eating carbs).
Taken with meals, Carb Fence support appetite control, promote fat loss while maintaining lean muscle mass, and support metabolic health over time. Consistency is key, with many users experiencing more noticeable benefits with regular use.
Use under the supervision of a healthcare professional.
Yes. Carb Fence can be taken with moderate alcohol consumption. However, excessive alcohol intake may negatively affect metabolism and weight management goals, so moderation is advised.
Yes. 100% vegan and free from GMO-derived ingredients.
WHY CARB FENCE
Appetite Control That's Actually Proven
Clinically evaluated appetite support that works from your first meal, without systemic exposure.
Powered by SiPore® technology
Clinically Tested. User Approved.
Backed by clinical trials and thousands of reviews
6 clinical trials
15+ years of research
20,000+ customers
4.7/5 star rating
Rated 4.7 / 5.0 by 20,000+ reviews
Customer Reviews
Customer Reviews
Overall rating: 4.7 / 5 from 329 reviews.
It took about a month for me to see a difference , i think i have now lost a few pounds. Some days i feel like it helps with appetite control and a feeling of fullness. I hope that my journey continues in this direction !
I ordered the trial pack and have only used it about five times, but I have noticed a reduction in my post meal glucose readings when I have had carbs. There was only one time when I had carbs and I took Carb Fence before eating that my glucose reading was still over 160 post meal, which is pretty high for me. I am new to this diagnosis, so I haven't had much experience tracking my numbers and I would have to use it several more times to be sure it's beneficial to me. It looks positive so far.
Although I have not lost weight in the couple of months I have been using CarbFence, it is has definitely gotten rid of the gnawing in my stomach that could never get satisfied. It also helps with staving off hunger pangs, if I listen to my stomach and not the psychological needs.
I started Carb Fence almost 1 month ago.
There are absolutely no adverse side affects that I have experienced. I was a little apprehensive at first because I do have digestive issues. However because it is FDA approved and considered food grade and not a drug, I was a little more confident in trying.
Then when the case came in,also I was a little leery about trying it, not knowing how it would taste. Let me assure you, the taste is refreshingly good, and I don’t “dread” having to take it before meals.
The greatest part of all of this is that I have actually lost 5 lbs. I’m not trying to lose a great amount of weight, but I am now 5 lbs closer to my goal.
The cost is not a great concern for me, but I did purchase the discount bulk quantity, and having the extra boxes on hand helps.
If I lose another 5 lbs while using Sigrid Carb Fence, I will most likely continue taking the gel indefinitely because I do feel as though the product has assisted me with hunger control & not absorbing carbs..
Thank you SIGRID for creating a safe non-drug product to enable people who are looking for an alternative to GLP-1 treatment.
This product worked very well for me. My fasting BS went from 130 to 115 and my after meal BS went from around 200 to 150! I, however, was approved for the new Wegovy Medicare D program and was advised to discontinue the glucose stabilizer until I have a better idea of my BS.
I have taken Sigrid with low calorie diet and lost 1 lb weekly for 6 months. I have now stuck for 3 months but continue the same regime to maintain weight. I highly recommend for appetite control.
It actually works. Still use common sense of course...but if you want a slice of pizza, or a few bits of desert when out with friends, it limits the amplitude and duration of the spike. Keeps things within the "green zone" for me. Kept some with me at all times on last week's trip to Boston. Warning...there are "anti spike" concoctions out there...they didn't do anything for me (and I canceled). I also think it's helped my weight loss! SIGRID really works.
I like the way a lot of my cravings have become less and less but I have not lost a pound yet and it is very expensive. Please do not send me any more product. I want to cancel future orders. Thank you,
Eileen Fuhrmeister
Eileen8624@duck.com
I really like it. It has a pleasant taste and it makes me feel full so I don’t eat as much. I never feel nauseous and it has not had any side effects on my digestion. I lost 6 lbs the first month without changing my diet and also ate some chocolate. Going on to month 2. Will try to watch what I eat better and see what the results bring.
I think it's working or my glucometer is broken. My fasting BS has gone from 130 to 99! After meals from 190-200 to 140. I have a physical this week and will know more after my blood work.
I’ve been taking Sigrid for 3 months now and I’ve seen a consistent stabilization of my blood sugar. I have a CGM because of insulin resistance and a risk of developing Type II diabetes. I’m unable to tolerate metformin and all of the GLP 1’s, originally designed to regulate A1C before they became miracle weight loss drugs for the non-insulin resistant, made me horribly ill. Sigrid has given me peace of mind. My A1C is routinely in the 5.5 to 6.0 range now, down from 7.5/8, with zero adverse side effects and I don’t fret over everything I eat.
I check my blood sugar especially after a heavier carb meal. If I ingest a packet of Sigrid before a carby meal, my blood sugar remains in range. I am not pre- or diabetic, but my glucose rises higher than I want with high glycemic foods.
Tasty product with no immediate side effects. Blunts glucose response. Sense of fullness. Safe for cardiac and renal patients as it is not absorbed. Supposed to take before meals. You could suck it out of packet or add to foods. Good afternoon snack.
The first couple times gave me slight nausea, nothing unbearable, but after that my meals got smaller and my energy level and even my mood improved! Definitely worth a go!!!
I just started today but I am so afraid it’s going to cause constipation that I waited about two weeks before I started it. Everything I read says it won’t cause G.I. concerns but I’m still worried. Nonetheless I started today and I’ll update on my progress as the week goes by.
