Ovasitol vs Ovasitol Plus: What the Added Ingredients Change

Disclosure: this page is flagged for affiliate content under PCOSguides’ editorial policy. Some links to Ovasitol or Ovasitol Plus below may be affiliate links, meaning PCOSguides could earn a small commission on a purchase at no extra cost to you. Every dose and ingredient figure below is taken directly from Theralogix’s own product pages, checked at the time of writing.

What is the actual difference between Ovasitol and Ovasitol Plus?

Three added ingredients are the entire difference: alpha-lactalbumin, chromium picolinate and vitamin D3. Both products are made by Theralogix and both deliver the identical 40:1 myo-inositol to D-chiro-inositol blend per scoop or packet, so the inositol dose itself is not the variable — what you’re actually choosing between is whether you want three additional ingredients bundled in, or a plain inositol-only formula.

What does the 40:1 ratio and 4,000 mg daily dose actually do?

Forty parts myo-inositol to one part D-chiro-inositol is the ratio the trial evidence supports, not an arbitrary label number. The International Consensus Conference on myo-inositol and D-chiro-inositol concluded that this 40:1 ratio reflects the balance naturally found in healthy ovarian tissue, and that the combination — dosed at 4,000 mg myo-inositol plus 100 mg D-chiro-inositol total per day — is the formulation supported by PCOS trial data. Both Ovasitol and Ovasitol Plus deliver that same total daily amount across two servings; this is what the trials tested, not an instruction to take a different amount than your own clinician recommends for your situation.

What does the added chromium picolinate change?

Chromium picolinate has its own separate trial base, and 200 mcg — the amount Ovasitol Plus’s label lists per daily dose — sits at the dose most commonly studied. A 2025 systematic review and meta-analysis of 10 randomized controlled trials covering 683 women with PCOS found chromium supplementation, compared with placebo, significantly reduced fasting insulin, triglycerides, total cholesterol, LDL and C-reactive protein, concluding a 200 mcg daily dose of chromium picolinate produced benefits on glucose and insulin measures broadly comparable to metformin across the pooled trials, with fewer reported side effects. This is chromium’s evidence, not inositol’s — it is additive information about a different ingredient, not proof that adding chromium to inositol produces a bigger combined effect than either alone, which has not been directly tested.

What does the added vitamin D3 change?

Less than the marketing framing suggests, on the specific marker most PCOS readers care about. A 2024 systematic review of nine randomized controlled trials, with study populations ranging from 28 to 180 participants, found that most trials of vitamin D supplementation showed no statistically significant improvement in fasting glucose, fasting insulin or HOMA-IR in women with PCOS — only two of nine trials found a significant drop in fasting insulin, and two found a significant improvement in HOMA-IR, with the rest reporting no difference. Vitamin D correcting a documented deficiency remains worthwhile for reasons beyond insulin resistance, but “improves insulin resistance” is not a claim the trial evidence for vitamin D specifically supports for most people with PCOS.

Does the alpha-lactalbumin in Ovasitol Plus actually improve absorption?

This is the one added ingredient this article cannot verify with a published trial, so it is written around rather than asserted as fact. Theralogix’s own product page states alpha-lactalbumin is included to enhance myo-inositol absorption; no independent, published human trial testing whether adding alpha-lactalbumin to a 40:1 inositol blend measurably changes blood myo-inositol levels or clinical outcomes compared with the same inositol dose alone was found for this article. That does not mean the mechanism is implausible — whey proteins do influence some nutrient transport — only that the specific combined-product claim has not been independently trial-tested, which is a different thing from the chromium and vitamin D additions above, both of which have their own separate trial bases.

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Is Ovasitol Plus worth the extra cost over plain Ovasitol?

That depends on whether you want three extra ingredients bundled into one scoop or would rather choose each separately. At the time of writing, Theralogix’s own site lists a 90-day supply of Ovasitol at roughly $74 and a 90-day supply of Ovasitol Plus at roughly $84 — a gap of about $10 across three months for the added chromium, vitamin D3 and alpha-lactalbumin. Prices change and vary by retailer, so check the current listing before buying either one rather than relying on a number printed here. If you already take a separate chromium or vitamin D supplement, or your clinician has you on a specific dose of either, plain Ovasitol avoids duplicating or under-dosing what you’re already taking; if you take neither and want one product covering both inositol and the two additions with trial-backed doses, Ovasitol Plus removes a second and third bottle from your routine.

What are the alternatives to Ovasitol?

Wholesome Story’s myo-and-D-chiro-inositol powder matches the same 40:1 ratio and the same 4,000 mg/100 mg daily numbers as Ovasitol and additionally offers a capsule format, which our full comparison of the best inositol supplements covers in more detail, including certification differences between the two brands. Plain myo-inositol powder with no D-chiro-inositol added, sold by brands including NOW Foods, is reliably the lowest-cost option per gram if your specific interest is myo-inositol alone rather than the combined ratio; our guide to inositol for PCOS covers what the myo-inositol-only trial evidence shows separately from the combined formulation.

Who should not take either product without talking to a clinician first?

• Anyone on thyroid medication, metformin, or a diabetes medication that already affects blood sugar — inositol, chromium and metformin can all influence glucose handling, and stacking them without medical guidance makes it harder to know what is causing a change. Our guide to inositol drug interactions covers the specific combinations worth flagging to a pharmacist or prescriber.
• Anyone with existing kidney or liver impairment, since chromium is cleared renally and the supplement’s safety in significant kidney disease has not been established in these trials.
• Anyone already taking a separate chromium or vitamin D supplement, where Ovasitol Plus risks duplicating a dose rather than adding a new benefit.

PCOS was renamed polyendocrine metabolic ovarian syndrome (PMOS) in a 2026 global consensus published in the Lancet, agreed by more than 50 organizations. Neither Ovasitol nor Ovasitol Plus’s labeling reflects the new name at the time of writing; the condition, and the trial evidence behind both products, is unchanged. This article uses PCOS throughout because that is still what most readers search. For the broader 2023 international PCOS guideline on where supplements fit relative to first-line lifestyle and medical management, see our reviews section for more brand-level comparisons, including our look at which PCOS books are worth reading and which lean too hard on restriction.