Ask almost any PCOS community which inositol powder to buy and Ovasitol comes up first. It has earned that reputation. So if you're weighing it against Regüsk Inositol Powder, here's a straight comparison using what each brand publishes on its own website. Full transparency: we make Regüsk Inositol Powder. That's why this sticks to label facts, including the places where Ovasitol comes out ahead.
The quick answer
- Choose Ovasitol if you want the highest daily dose of plain 40:1 inositol, NSF certification, and nothing else in the scoop.
- Choose Regüsk Inositol Powder if you want one flavoured, pre-measured sachet a day that also covers active folate, magnesium and botanicals.
Regüsk Inositol Powder vs Ovasitol: side by side
Based on each brand's website, October 2026. Always check the current label before buying.
| Regüsk Inositol Powder | Ovasitol (Theralogix) | |
|---|---|---|
| Format | Pre-measured 4g sachet | Canister with scoop, or single-serve packets |
| Servings per day | 1 | 2 |
| Myo-inositol per day | 1,100mg | 4,000mg (2,000mg × 2) |
| D-chiro-inositol per day | 27.5mg | 100mg (50mg × 2) |
| Ratio | 40:1 | 40:1 |
| Also contains | L-methylfolate 440mcg, magnesium glycinate, ashwagandha, chaste berry, maca, vitamin B6 | Nothing. 100% inositol |
| Flavour | Blackberry lemon | Unflavoured |
| Testing | Third-party tested by Eurofins | NSF, independently tested and content certified |
| Vegan | Yes | Yes |
What these two inositol powders share
Both use a 40:1 ratio of myo-inositol to d-chiro-inositol, which mirrors the ratio normally found in the blood (Nordio et al., 2019). Both are vegan, both are independently tested, and both dissolve into a drink with no pills to swallow.
Where they differ
1. Daily dose
Ovasitol gives you nearly four times more inositol per day. If dose is your top priority, that's a clear win for Ovasitol.
Regüsk's lower dose is deliberate. Some 40:1 studies used 550mg myo + 13.8mg d-chiro twice a day, the same daily totals as one Regüsk sachet, although those studies used a soft-gel capsule. The review behind the 2023 international PCOS guideline found the overall evidence for inositol "limited and inconclusive", with no clear winner between dosing regimens (Fitz et al., 2024).
2. One job or several
Ovasitol does one thing and keeps it pure. If you also take folate or magnesium, those stay as separate products. Regüsk Inositol Powder puts active folate, magnesium glycinate and a small botanical blend in the same sachet. We explain the thinking, and its limits, in why we add botanicals to inositol powder.
3. Once a day or twice
Ovasitol is taken morning and evening. Regüsk Inositol Powder is one sachet at the same time each day. If you tend to forget a second dose, that matters more than it sounds.
4. Taste
Ovasitol is unflavoured and stirs into any non-carbonated drink. Regüsk Inositol Powder is blackberry lemon, and you can take it straight, in water or in a smoothie.
5. Pregnancy and trying to conceive
This one favours Ovasitol. Because it is pure inositol, Theralogix says it can be continued in pregnancy with your provider's guidance. Regüsk Inositol Powder contains ashwagandha and chaste berry, so it is not recommended during pregnancy or breastfeeding, and you should speak to your healthcare professional first if you're trying to conceive.
Which inositol powder should you choose?
- You want the highest dose of pure inositol: Ovasitol.
- You're pregnant or trying to conceive: talk to your doctor. A pure inositol powder is the simpler conversation.
- You already juggle inositol, folate and magnesium separately: Regüsk Inositol Powder combines them.
-
You dislike unflavoured powder or miss second doses: Regüsk's once-daily flavoured sachet.
- You want the deepest hormonal reset in a convenient sized sachet: Regüsk Inositol Powder
Comparing more brands? See our six-brand inositol powder comparison.
Try Regüsk Inositol Powder
One blackberry-lemon sachet a day with 40:1 inositol, active folate and magnesium. Shop Regüsk Inositol Powder with free shipping and a 100-day guarantee.
Sources
- Theralogix. Ovasitol Inositol Powder: product page and FAQ. Accessed October 2026.
- Fitz V, et al. Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-based PCOS Guidelines. J Clin Endocrinol Metab. 2024;109(6):1630–1655. doi:10.1210/clinem/dgad762
- Nordio M, Basciani S, Camajani E. The 40:1 myo-inositol/D-chiro-inositol plasma ratio is able to restore ovulation in PCOS patients: comparison with other ratios. Eur Rev Med Pharmacol Sci. 2019;23(12):5512–5521. PubMed
This article is for general information only and isn't medical advice. Regüsk Inositol Powder is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease. Ovasitol is a trademark of its owner, and Regüsk is not affiliated with Theralogix. Comparison details were taken from the brand's website at the time of writing, so check the current label before buying. Talk to your healthcare professional before starting any supplement.