4.75 out of 5 across 148 verified reviews
This has worked well as part of my nighttime routine. I like the capsule format and have not noticed any unwanted aftertaste.
Verified purchaseI was looking for a KSM-66 product in capsule form and decided to try this one. So far, I am very satisfied with the purchase. I usually take it in the evening.
Verified purchaseI like the clean look of the bottle and the easy serving size. It is one of the few supplements I actually remember to take consistently.
Verified purchaseFeel the difference. Every single day.
KSM-66® Ashwagandha supports a calmer stress response, easier sleep, and steadier focus, without sedation or stimulants.
from 148 reviews
Stress & Calm
Helps your body handle everyday stress. Supports a calmer baseline.†
Stress response support 02Sleep & Recovery
Supports healthy sleep, an easier wind down, and waking up more rested.†
No dependency 03Focus & Clarity
Supports steady, calm focus through the afternoon fog.†
Cognitive support 04Mood
For days you feel less like yourself. Supports emotional balance and a steadier baseline.†
Emotional balance 05Energy & Performance
For workouts that used to feel easy. Supports strength, endurance, and recovery.†
Endurance support 06Daily Resilience
For busy seasons, travel, and high pressure weeks. One daily adaptogen.†
Whole body balance
Some weeks ask more of you than others.
When the pressure stays on, winding down gets harder and focus gets thinner. A steady daily routine is what most people are missing.
Constant mental fog
Waking up exhausted
Running on empty
Overwhelmed daily
Can't focus for long
Mood swings and irritability
Stress should ease through the day. KSM-66® supports a healthy stress response so your body can find its way back to baseline.†
One root. Done right.
Optibio uses KSM-66® ashwagandha, made only from the root and standardized to 5% withanolides.
Full spectrum. Root only.
Third party tested.
KSM-66® is a full spectrum extract made only from ashwagandha root, standardized to 5% withanolides and refined over more than a decade.
Patented extraction
Solvent free process
Root only extract
Made for stress, sleep, and focus routines
One ingredient. One daily routine.
KSM-66® supports your body's natural stress response.†
KSM-66® Ashwagandha 600mg, 90 Capsules, Optibio
Premium Root Extract Capsules
Support calm, sleep, focus, recovery, and your body's natural stress response with KSM-66® ashwagandha root extract, root only at a full 600 mg serving.
Key Benefits
- Supports stress resilience and calm*
- Supports sleep and recovery*
- Supports focus and clarity*
- Supports the body's natural stress response*
Per serving
Capsules
Day supply
Root extract
New here? Your first bottle is 50% off, and you can cancel anytime. No reason to wait.
90 Day
Money Back Guarantee
Third Party
Tested
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Why OptiBio? +
Benefits +
How to Use +
Ingredients +
Supplement Facts +
Science & Clinical Ingredient +
FAQs +
Not all ashwagandha is the same.
The ingredient name is only the start. What matters is the extract, the dose, the testing, and the manufacturing standard behind every bottle.
Optibio vs. Generic Ashwagandha
The difference is not just the ingredient name. It's the extract, dose, testing, and manufacturing standard behind every bottle.
| Feature | Optibio KSM-66® | Generic Ashwagandha |
|---|---|---|
| Extract pedigree | Branded KSM-66®, root only | Unbranded powder |
| Extract Source | Root only | Often root + leaf |
| Active Standard | 5% withanolides | Typically 1 to 2% |
| Extraction Method | Patented, solvent free | Often chemical based |
| Quality Testing | Third party tested | Usually not tested |
| Manufacturing | USA, GMP certified | Varies |
Two capsules. Once a day. That's it.
No complicated protocols. No timing windows. Just 2 capsules with water after breakfast or dinner, and let the science do the rest.
once daily
Premium Ingredients
KSM-66® sourced from certified, ethical partners with full traceability.
Third Party Tested
Every batch independently tested for purity, potency, and contaminants.
GMP Certified
Manufactured in a USA cGMP certified facility under strict quality standards.
No Fillers
No artificial colors, flavors, binders, or unnecessary additives.
Sustainable
Ethical sourcing, solvent free extraction, and responsible manufacturing.
Questions before you start?
Everything you need to know about KSM-66®, Optibio, and what to expect.
KSM-66® is a root only ashwagandha extract, made exclusively from the root (not the leaf), using a patented, solvent free extraction process that preserves the full spectrum of active withanolides. Most ashwagandha supplements on the market use generic powder with no standardization behind the extract. KSM-66® is the difference between a named, traceable extract and a mystery powder.
Ashwagandha is an adaptogen, a class of herbs traditionally used to help the body adapt to everyday stress. KSM-66® supports a healthy stress response so you can wind down naturally.† It is not a sedative and not a stimulant, and it doesn't mask how you feel.
Yes. KSM-66® at a 600mg daily serving is well tolerated and is commonly taken daily over long periods. It is non habit forming and does not cause dependency. The most common side effect in a small number of people is mild gastrointestinal sensitivity, taking it with food resolves this in almost all cases. If you are pregnant, nursing, or taking prescription medication (particularly immunosuppressants or thyroid medication), consult your physician before starting.
Three things separate Optibio from most ashwagandha products on the market. First, we use KSM-66®, a patented root only ashwagandha extract. Most brands use unbranded ashwagandha powder. Second, we use a full 600mg daily serving. Many competitors use only 200 to 300mg. Third, every batch is third party tested for purity and potency, and manufactured in a USA GMP certified facility. We don't cut corners on the ingredient, the dose, or the manufacturing standard. See how the top brands compare in our buyer's guide.
Most people notice the first signs of improvement, calmer days, less reactive to stress, slightly better sleep, within 2 to 4 weeks of consistent daily use. The full effect builds over 6 to 8 weeks of consistent use. This is why we recommend starting with a subscription, it gives you enough time to experience the full benefit and make a fair assessment. The 90 day money back guarantee exists precisely because we know results take time and we want you to have the full window to judge. Read the full timeline guide.
You get a full refund, no questions, no forms, no hassle. Email us at support@optibiosupplements.com within 90 days of your purchase and we will refund your entire order. We take on the risk so you don't have to. We're confident in the science behind KSM-66® and in our product, but we also know that no supplement works identically for every person, and we believe you should be able to try it without financial risk.