Fertility & egg quality

What actually decides this outcome, in order of size

The single most useful fact about this page is that its central claim has no direct measurement. Ranked by how much of the outcome each one owns:

1. Age, which sets the aneuploidy rate and is not modifiable. Everything below is a modifier on a curve that age draws. Saying so is not defeatism; it is what makes the modifiers worth ranking honestly rather than stacking hopefully.
2. The difference between how many and how good, because the tests only measure the first. Anti-Müllerian Hormone (AMH) estimates the size of the remaining follicle pool. It does not estimate whether those follicles will produce a chromosomally normal embryo, and its clinical caveats are their own literature Li 2021. Assay standardization has been an explicit problem Ferguson 2018, so a value from one platform is not interchangeable with a value from another.
3. The follicular timeline, because it sets the trial length. Antral development to ovulation runs across roughly three months, which is why every supplement protocol on this page is written in that unit and why judging any of them at four weeks is judging a cohort of follicles that was already committed before you started. That is developmental biology rather than a marketing convention.
4. Whether the underlying problem is ovulatory, and specifically whether it is the polycystic ovary pattern. That changes the whole page. Inositol has a systematic review and meta-analysis conducted to inform guideline development in that condition Fitz 2024, another meta-analysis of efficacy and safety Greff 2023, and an early randomized trial of ovarian function Gerli 2007. The randomized comparison of ovulation induction strategies is the background document Legro 2007.
5. Iodine and thyroid status, because they act on conception and gestation rather than on a symptom. The importance of iodine sufficiency and normal thyroid function in fertility and during gestation has been reviewed Feldt-Rasmussen 2025. TSH (Thyroid-Stimulating Hormone) with Thyroid Antibodies (TPO + TgAb) belongs on the first requisition, and thyroid autoantibodies matter here even when the hormone values look acceptable.
6. The mitochondrial argument, which is the reason this pathway exists and is one step less established than its popularity suggests. Coenzyme Q10 metabolism still has unresolved issues Mantle 2023, and the oxidized and reduced forms have been compared as supplements Fladerer 2023. The oocyte carries the mitochondria the embryo starts with, which is a strong mechanistic story; it is not the same thing as a demonstrated live-birth effect.

The order to run these in, and what has to be true first

Test, correct, then run one protocol for at least three months because the follicle takes that long. The ordering principle is the follicular timeline, not evidence tier.

1. One requisition on days two to four, before anything. Anti-Müllerian Hormone (AMH), LH & FSH, Estradiol, Sensitive (LC/MS-MS), Prolactin, TSH (Thyroid-Stimulating Hormone) with Thyroid Antibodies (TPO + TgAb), Ferritin, Vitamin D (25-Hydroxy), HbA1c (Hemoglobin A1c) and Fasting Insulin. Add a mid-luteal Progesterone on the same cycle to establish that ovulation is happening at all.
2. Prenatal and Methylfolate (5-MTHF) from the moment conception is being considered, not from the moment it is being attempted. Neural tube closure happens before most people know, which is why the timing is the intervention. Iodine sufficiency is part of the same argument Feldt-Rasmussen 2025.
3. Correct what the panel found, in this order: thyroid, iron, vitamin D, glucose. These are the four that change outcomes through established routes rather than through an oocyte-quality argument, and correcting them is cheap.
4. Myo-Inositol next if the pattern is the polycystic ovary one, and only then. The evidence base is condition-specific Fitz 2024 Greff 2023, and the ratio matters: high-dose D-chiro-inositol alone induced a polycystic-ovary-like picture in a mouse model Bevilacqua 2021, which is a reason to read the label rather than assume all inositol is the same product.
5. CoQ10 or Ubiquinol next, for three months, on the mitochondrial argument. Conversion capacity falls with age, which is the case for the reduced form Fladerer 2023; the metabolism has open questions worth knowing about Mantle 2023. Three months because of the follicular timeline above.
6. Melatonin has the most specific trial literature on this pathway and it belongs to the assisted-reproduction setting. Oral melatonin during in vitro fertilization has a systematic review and meta-analysis of randomized trials Mejlhede 2021. It is also a chronobiotic that shifts circadian phase, so taking it at an arbitrary hour has a second effect nobody planned.
7. NAC and Omega-3 (Fish Oil) sit beside those as oxidative and membrane arguments, and Iron Complex only if Ferritin says so. Iron supplementation without a deficit is not neutral.
8. NMN, Calcium AKG and Royal Jelly are the extrapolated end and are labeled as such. Nicotinamide riboside raises the NAD pool in humans Martens 2018 and an alpha-ketoglutarate formulation has a human report on biological age measures Demidenko 2021; neither of those is an oocyte endpoint, and the rodent fertility work has not been reproduced in people. That is a mechanism worth watching, not a purchase with a result behind it.

What gets bought for this that cannot move it

The category that fails structurally is the antioxidant blend bought against an anti-Mullerian hormone value. That marker estimates pool size Li 2021, and no supplement recruits new follicles into a pool that was fixed before birth. A blend that leaves the number unchanged has not failed at its mechanism, and a blend that appears to raise it has probably met an assay difference between platforms Ferguson 2018. Either way the number is answering a different question from the one being asked.

The surrogate problem on this page is total. Every product here claims to improve quality; the available measurements are pool size, hormone concentrations and, in a clinic, fertilization and blastocyst rates. Outside an assisted-reproduction cycle there is no read-out of oocyte quality at all, which is precisely why the melatonin evidence sits inside that setting Mejlhede 2021. A reader trying naturally can measure that she ovulated and that her thyroid, iron and glucose are in order, and cannot measure the thing the page is named after. Saying so is the honest version of this section.

Two product-level misses. Inositol is sold as one ingredient and is at least two, with a ratio that matters and a preclinical warning attached to one of them at high dose Bevilacqua 2021. And coenzyme Q10 products differ in form and absorption enough that a milligram figure on a label is not an exposure Fladerer 2023.

If the goal underneath is different, so is the page. If cycles are irregular and androgenic, the metabolic route at PCOS — insulin, androgens & ovulation comes first Legro 2007. If the luteal phase is short, Luteal phase & progesterone support. If the male partner has not been tested, that is half the problem untested and it is the cheapest test in the whole process. And twelve months of trying without conception, or six months over thirty-five, is a fertility assessment rather than another supplement.

How you would know it was working, on a real read-out and a real timescale

This page makes two predictions. A mid-luteal Progesterone confirms or refutes ovulation and nothing on this shelf changes which answer you get; and Anti-Müllerian Hormone (AMH) will not move on any of these protocols, which is the correct result rather than a disappointing one Li 2021.

• Progesterone, mid-luteal, for two consecutive cycles. Seven days after the ovulation of that cycle rather than a fixed calendar day. This is the only cheap functional read-out on the page.
• Anti-Müllerian Hormone (AMH) once, on one platform, and read as quantity. If it is repeated at all, repeat it on the same assay, because standardization has been the documented weakness Ferguson 2018.
• TSH (Thyroid-Stimulating Hormone) with Thyroid Antibodies (TPO + TgAb) at baseline and 12 weeks after any change. Twelve weeks because thyroid hormone equilibration after a dose change takes six to eight, and the antibodies matter independently of the hormone values Feldt-Rasmussen 2025.
• Ferritin and Vitamin D (25-Hydroxy) at baseline and 12 weeks. Both integrate over months rather than weeks, which is why an earlier repeat measures the dose rather than the store.
• HbA1c (Hemoglobin A1c) with Fasting Insulin at baseline and 12 weeks if the pattern is androgenic. This is the pathway where inositol and metformin are being judged, and glucose is the read-out that responds Fitz 2024.

What will fool you. Anti-Mullerian hormone varies between assay platforms enough to look like a change that never happened Ferguson 2018, and hormonal contraception suppresses it. Biotin at supplement doses interferes with several of these immunoassays. A cycle in which conception happens looks identical to one in which it does not until the test. Three months is the minimum honest trial length because of the follicular timeline, so a two-cycle verdict is not a verdict. And melatonin taken at a variable hour shifts circadian phase as well as acting as an antioxidant, so a sleep change is not evidence about oocytes Mejlhede 2021.

Sources read for these sections

• Li HWR, et al. Challenges in Measuring AMH in the Clinical Setting. Frontiers in Endocrinology 2021 · PMID 34108942
• Ferguson JM, et al. Towards international standardization of immunoassays for Mullerian inhibiting substance/anti-Mullerian hormone. Reproductive BioMedicine Online 2018 · PMID 30241771
• Mejlhede MAB. Oral melatonin supplementation during in vitro fertilization treatment: a systematic PRISMA review and meta-analysis of randomized controlled trials. Gynecological Endocrinology 2021 · PMID 34494508
• 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. Journal of Clinical Endocrinology and Metabolism 2024 · PMID 38163998
• Gerli S, et al. Randomized, double blind placebo-controlled trial: effects of myo-inositol on ovarian function and metabolic factors in women with PCOS. European Review for Medical and Pharmacological Sciences 2007 · PMID 18074942
• Greff D, et al. Inositol is an effective and safe treatment in polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled trials. Reproductive Biology and Endocrinology 2023 · PMID 36703143
• Bevilacqua A. High Doses of D-Chiro-Inositol Alone Induce a PCO-Like Syndrome and Other Alterations in Mouse Ovaries. Int J Mol Sci 2021 · PMID 34073634
• Fladerer JP, et al. Comparison of Coenzyme Q10 (Ubiquinone) and Reduced Coenzyme Q10 (Ubiquinol) as Supplement to Prevent Cardiovascular Disease and Reduce Cardiovascular Mortality. Current Cardiology Reports 2023 · PMID 37971634
• Mantle D, et al. Coenzyme Q10 Metabolism: A Review of Unresolved Issues. International Journal of Molecular Sciences 2023 · PMID 36768907
• Feldt-Rasmussen U. Importance of iodide sufficiency and normal thyroid function in fertility and during gestation. Thyroid Research 2025 · PMID 40420166
• Legro RS. Clomiphene, metformin, or both for infertility in the polycystic ovary syndrome. New England Journal of Medicine 2007;356(6):551-66 · PMID 17287476
• Martens CR, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD(+) in healthy middle-aged and older adults. Nature Communications, 2018 · PMID 29599478
• Demidenko O, et al. Rejuvant, a potential life-extending compound formulation with alpha-ketoglutarate and vitamins, conferred an average 8 year reduction in biological aging, after an average of 7 months of use, in the TruAge DNA methylation test. Aging 2021;13(24):24485-24499 · PMID 34847066