I love ONYX because it gives me the energy I want without making me feel crazy or jittery.
ONYX® Extreme Fat Burner
- Regular price
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$42.00 - Regular price
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- Sale price
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$42.00
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ONYX® — Advanced Thermogenic Support for Women
Fat loss that works with your body — not against it.
ONYX® is BeautyFit’s most advanced thermogenic formula, created specifically for women who want real, noticeable fat-loss support without crashes, jitters, or burnout. Designed for female physiology, evolving hormones, and busy modern lives, ONYX helps your body respond better, feel better, and perform better — whether you’re balancing workouts, career, family, or all of the above.
This next-generation formula supports fat burning, elevates metabolic output, and helps target stubborn body fat while promoting appetite control, clean energy, and steady mental focus. The result is a system that helps you stay consistent, confident, and in control — instead of fighting your body every day.
Unlike harsh stimulants or one-dimensional fat burners, ONYX is built to support the whole woman. You’ll feel energized but steady. Focused but calm. Leaner without feeling depleted.
Because fat loss shouldn’t feel like punishment — it should feel empowering.
Why Women Choose ONYX®
Supports Maximum Fat Burning
Helps activate thermogenesis so your body can more effectively use stored fat for fuel — including stubborn areas that resist change.
Elevates Metabolic Rate
Designed to support metabolic output as it naturally shifts with age, stress, and hormonal transitions.
Supports Appetite & Craving Control
Helps you feel satisfied and in control, making consistency easier without white-knuckling hunger.
Clean, Sustained Energy — No Crash
Provides smooth, reliable energy throughout the day without jitters, anxiety, or afternoon drop-offs.
Enhances Mental Focus & Drive
Supports clarity, motivation, and mood so you show up fully — in training, work, and life.
Supports Recovery & Daily Performance
Built for real lifestyles, helping maintain momentum beyond just calorie burn.
How You’ll Feel
Leaner · Lighter · More energized
Sharper focus · Less bloating · Fewer cravings
More confident in your body again
Clinical “How It Works”
ONYX combines pharmaceutical-quality, research-backed ingredients that work synergistically to support female fat metabolism, energy production, and mental performance.
Capsimax® (Capsaicinoids from Cayenne)
A clinically studied extract of red chili compounds shown to increase thermogenesis and fat utilization. Research demonstrated significantly higher free fatty acid levels before and after exercise—an indicator that the body is releasing stored fat to be used as energy. This targeted mechanism helps support metabolic output without harsh stimulation.
TeaCrine® (Theacrine Complex)
A patented compound known to support energy, motivation, and mental clarity without the tolerance build-up commonly seen with caffeine alone. Women often describe feeling “on” without feeling overstimulated.
Caffeine Anhydrous
A purified form of caffeine that supports alertness, workout performance, and metabolic activity while helping reduce perceived fatigue.
Bitter Orange Fruit Extract
Works synergistically with caffeine to support metabolic rate, energy expenditure, and healthy blood-sugar balance.
Complementary Botanicals
Aronia, olive leaf, sacred lotus, evodia, and yohimbe extracts provide multi-pathway support for metabolism, circulation, and energy dynamics — creating a comprehensive, female-focused approach rather than a single-ingredient shortcut.
Together, these ingredients encourage your body to mobilize stored fat, support steady energy, and maintain mental focus — without the harsh peaks and valleys of traditional burners.
Designed for Real Women
ONYX® was formulated for women navigating:
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Hormonal changes & slower metabolism
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Busy schedules & daily stress
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Training plateaus
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Cravings and appetite fluctuations
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The desire to feel strong — not depleted
No gimmicks. No extremes. Just intelligent support for the body you live in now.
If you’re ready to stop fighting your body and start working with it — ONYX belongs in your daily routine.
Suggested Use
Initial Phase:
Take 1 capsule daily for the first 3 days to assess tolerance.
Regular Use:
Take 2 capsules 1–2 times per day before or with meals.
Avoid within 4 hours of bedtime. Do not exceed recommended dosage.
Use alongside quality nutrition, regular exercise, and proper hydration.
Frequently Asked Questions
Is ONYX® suitable during peri-menopause or menopause?
Yes. ONYX was created with women’s changing hormones in mind. It supports metabolic output, appetite balance, and steady energy without harsh crashes — helping you stay consistent even when your body feels different than it used to. If stimulant-sensitive, begin with 1 capsule daily.
I’m sensitive to stimulants — can I still use ONYX?
Many women who struggle with typical fat burners do well with ONYX because the formula delivers smooth, sustained energy. TeaCrine® helps support focus without the edgy feeling often linked to caffeine alone. Start with 1 capsule for the first few days to assess tolerance.
Can I stack ONYX with BeautySlender®?
Yes — this is a powerful, complementary system.
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ONYX®: supports thermogenesis, energy, and metabolic drive
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BeautySlender®: supports appetite control and cravings
Together they provide a 24-hour approach to help you burn better while staying in control of food choices.
When is the best time to take ONYX?
Most women take 2 capsules in the morning before or with breakfast, with an optional second serving early afternoon if needed. Avoid within 4 hours of bedtime.
How soon will I notice results?
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Days 1–3: smoother energy, improved focus
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Week 1–2: less bloating, better appetite control
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Week 2–4: more visible body changes when paired with nutrition and exercise
Quality You Can Trust
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Highest pharmaceutical-grade sourced ingredients
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Patented actives: TeaCrine® & Capsimax®
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Manufactured to strict quality standards
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Formulated specifically for women
Important Medical Disclaimer
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Results may vary depending on individual factors including diet, exercise, age, and overall health.
ONYX® is intended for healthy adults 18 years or older. Do not use if you are pregnant, nursing, taking medication, or have a medical condition including but not limited to heart conditions, high blood pressure, thyroid disorders, anxiety disorders, or sensitivity to stimulants. Consult a healthcare professional before use, especially if you are under medical supervision.
Discontinue use and consult a physician if you experience rapid heartbeat, dizziness, headaches, or other adverse reactions. Do not exceed recommended dosage. Avoid combining with other stimulant products. Keep out of reach of children.
Customer Reviews
Overall rating: 4.9 / 5 from 222 reviews.
ONYX is officially my favorite BeautyFit product—the energy, appetite support, and results have been incredible.
I’m already ordering my second bottle because I’m seeing results and feeling better than I have in months.
I’m 42 and losing weight has gotten harder, but ONYX has helped me finally make progress again
This is hands down the best weight-loss supplement I’ve used, and I’ve tried a lot of them.
I finally started seeing the scale move again, and my energy has been great.
Very smooth and alot of energy. Lost 6 pounds already
One of the best fat burners I ever have used!
To soon to tell but so far no bad side effects, no weight loss yet but I dont seem to be as hungry and dont feel the need to snack in the late afternoon.
Nothing like it!
I love how this doesn’t give me a crash later in the day. Just smooth energy that lasts, and I can actually sleep at night.
I’ve tried a lot of fat burners over the years, but Onyx is the first one that gave me clean energy without jitters. I felt sharp and focused throughout the day.
Within two weeks I noticed the scale moving down steadily. My clothes fit looser and my workouts felt stronger because I wasn’t dragging through them.
Finally got Onyx back from being out of stock! This works and is my favorite. I definitely recommend it. Thanks BeautyFIt ❤️
I like it cause it gives me energy without any side effects.
I take my onyx every morning with 8oz of water. This product works!
Absolutely love the Onyx. I have been taking for 6 months and have lost 37lbs. I feel incredible! Thank you Beautyfit ❤️
Great product and amazing service.
Just received my second bottle. I love this stuff!
Onyx is helping me achieve my weight loss goals faster and more efficiently.
Onyx has been a game-changer for me, providing sustained energy throughout the day and aiding in my weight loss journey.
I have been on the ONYX for a while now and I like that they do not give me the shakes or upset my tummy and they help me maintain my weight.
Almost finished first bottle and have definitely lost weight. Curbed appetite and cravings. No jitters!
Love this stuff! Feel the burn without the jitters! Take one every morning before I start my day.
Onyx has been a total game-changer for me. I feel healthier, more energized, and my clothes fit better than ever!
Great product
I have been using Onyx fat loss pills for a while and I have lost over 50 lbs. and kept it off for over a year. I like how they curve my appetite and do not give me the shakes.
I lost 16lbs in 4 weeks with onyx. I feel great!
With the Onyx Fat Burner, I've experienced a consistent increase in my energy levels throughout the day, enabling me to stay active which I lost 25 pounds so far. :)
I’ve lost 60 pounds and counting on this product. I am almost to my weight loss goal and will continue taking this so I can hit my goal. Highly recommend!
With Onyx, I experienced no crash or jittery feeling, just a steady and smooth surge of energy that propelled me through intense workouts.
Onyx not only helps with my fat burning but also enhances my mental focus and concentration, giving me the extra edge during workouts.I highly recommend it.
This product not only helps with fat burning but also enhances mental focus and concentration, giving me the extra edge during workouts.
If you're looking for a fat burner that delivers results, Onyx is the way to go—it helped me shed stubborn pounds.
I was skeptical at first, but Onyx exceeded my expectations by delivering a consistent energy boost and supporting my fat loss goals effectively.
This fat burner is the real deal! In just two weeks of using Onyx, I already shed 8 pounds and can see a noticeable difference in my body.
I have been taking these pills for a while and I just love how it curves my appetite and keeps my weight off. I have lost 60 pounds and still going, I luv how it does not give me the shakes but does give me energy.
So far I like the Onyx ,no jitters, energy is good .
This is a great product. I would highly recommend.
The Onyx has become a staple in my fitness routine, as it provides a noticeable boost in my metabolism and enhances my workout performance.