Where to Buy Inositol in Singapore — and How to Read the Label

If you've read that inositol is one of the best-studied supplements for PCOS — now renamed PMOS (Polyendocrine Metabolic Ovarian Syndrome) following the 2026 Lancet consensus — the next question is often a practical one: where do you buy it in Singapore, and how do you know you're choosing the right product?

Inositol is widely available in Singapore, but products differ in formulation. Two bottles at a similar price may contain different types or combinations of inositol, making it worth checking the label before you buy.

This guide covers everything you need to know before buying inositol in Singapore — from understanding different formulations and what to look for on the label to choosing a product based on current evidence rather than marketing claims.

Understanding inositol formulations

Before deciding where to buy it, take a close look at the label.

The two forms of inositol most commonly used in PMOS are myo-inositol and D-chiro-inositol. Much of the clinical evidence supporting inositol is based on formulations containing these two forms in a 40:1 ratio, which reflects the ratio found naturally in the body.

Some studies suggest that formulations containing proportionally higher amounts of D-chiro-inositol may be less favourable for ovarian function, which is why more D-chiro is not necessarily better.

When comparing products, the most useful question to ask is simple:

Does the label clearly state a 40:1 myo-inositol to D-chiro-inositol ratio, or is it a myo-inositol-only product?

Both can be reasonable choices. A myo-inositol-only formulation taken at around 2 g twice daily remains one of the most widely studied approaches.

If a product combines myo-inositol with D-chiro-inositol but does not state the ratio, it can be difficult to know whether the formulation reflects those studied in clinical research.

Where to buy it in Singapore

In Singapore, inositol is sold as a dietary supplement rather than a prescription medicine, so it is widely available over the counter.

On the pharmacy shelf. Watsons Singapore lists MOOM Health's Happy Hormones, a lemon-flavoured powder sachet from a Singapore-based brand, in boxes of 30. It is a useful example of a label that publishes its numbers: the brand states 2,000 mg of myo-inositol and 50 mg of D-chiro-inositol per sachet — the 40:1 blend written out in milligrams rather than just claimed on the front of the box. Guardian also carries inositol in store and online, including a Biowell Dr. Austin Inositol+ 30s listing.

The point is not which brand you end up with. It is that some labels publish both amounts and some don't, and the only way to tell is to turn the box over before you pay.

Online. Marketplaces that ship locally and overseas supplement retailers carry a wider range of formulations than the pharmacy shelf does, including plain myo-inositol powders in larger tubs, which is usually where the cost per gram is lowest. The trade-off is that you cannot handle the label before buying — so read the supplement facts panel in the product photos, and treat a listing that shows only the front of the box as an unanswered question.

Buying in person has one practical advantage — you can read the label yourself before purchasing and check the formulation. Availability and pricing vary between outlets, and both change often enough that it is worth checking rather than assuming.

Prices also vary depending on the formulation, dose and whether the product comes as a powder or capsules. Rather than focusing only on the lowest price, it's worth comparing the formulation and the cost per effective daily dose.

Powder or capsules?

The choice between powder and capsules is largely one of convenience.

The most commonly studied dose is around 2 g of myo-inositol twice daily. Depending on the strength of each capsule, this may mean taking several capsules a day. Powder can make it easier to achieve the same dose and is often more economical on a cost-per-gram basis.

Capsules may be more convenient for travel or women who prefer a pre-measured dose, while powder is often chosen for long-term daily use.

What to expect from inositol

Inositol is generally well tolerated and has a favourable safety profile, but it is not a complete treatment for PMOS.

Research suggests that inositol may be particularly helpful when insulin resistance is part of the underlying picture. However, not everyone responds in the same way. If you've taken it consistently for around three months without noticing meaningful improvement, changing brands may not be the answer. Your symptoms may be influenced by other factors, and it may be worth reviewing your overall management plan rather than simply switching supplements.

It's also worth remembering that taking a supplement is only one part of managing PMOS. A medical assessment helps build a clearer picture of the metabolic and hormonal factors contributing to your symptoms. Depending on your individual situation, your doctor may consider investigations such as SHBG, fasting insulin, HOMA-IR or other metabolic and hormonal markers alongside routine assessment. Our guide to PCOS testing in Singapore explains where these assessments are available and how they fit into the broader evaluation of PMOS.

For the wider picture, our guide to PCOS treatment options in Singapore maps where supplements sit alongside the medical routes and who prescribes what. If you are also weighing non-pharmaceutical options, we look at what the evidence does and doesn't support for TCM in the same way we've looked at labels here.

Where to start

If you're choosing an inositol supplement, start by checking whether it contains a 40:1 myo-inositol to D-chiro-inositol ratio or is a myo-inositol-only formulation. Choose a product you'll realistically take consistently, and allow around three months before deciding whether it's helping.

If you'd rather not compare labels yourself or are unsure whether inositol is the right option for you, Oestra is designed to help. Our free 5-minute assessment identifies the metabolic and hormonal patterns that may be contributing to your PMOS symptoms. Based on those results, we provide personalised lifestyle guidance and, where appropriate, evidence-based supplement recommendations tailored to your individual profile.

Whichever approach you choose, the same principle applies: choose supplements based on evidence and your individual health profile — not simply on marketing claims or packaging.

Citations

• Teede HJ, et al. Polyendocrine Metabolic Ovarian Syndrome: A Multistep Global Consensus Process. The Lancet, 2026.
• Pustotina O, Myers SH, Unfer V, Rasulova I. The Effects of Myo-Inositol and D-Chiro-Inositol in a Ratio 40:1 on Hormonal and Metabolic Profile in Women with Polycystic Ovary Syndrome Classified as Phenotype A by the Rotterdam Criteria and EMS-Type 1 by the EGOI Criteria. Gynecologic and Obstetric Investigation, 2024;89(2):131–139. PMID 38295772.
• Product label information as published by the manufacturers and retailers: MOOM Health (Happy Hormones, myo-inositol and D-chiro-inositol per sachet), Watsons Singapore and Guardian Singapore product listings. Formulations, prices and stock change — check the current label.