Function Health BBB and Consumer Complaint Trends: What Women Should Know Before Subscribing

Is Function Health Legit? The Short Answer

Function Health is a real company operating a real service. The labs it orders are processed through CLIA-certified partner laboratories, which means the analytical results themselves meet federal accuracy standards. The company was co-founded by physician Mark Hyman, MD, and has received venture funding.

"Legit" and "right for you" are different questions. Consumer complaints filed with the Better Business Bureau and across review platforms point to recurring friction around billing transparency, subscription cancellations, and, critically for women, the absence of guided clinical interpretation when results fall outside reference ranges.

What the BBB Record Actually Shows

As of mid-2025, Function Health is not accredited by the Better Business Bureau. BBB accreditation is voluntary and fee-based, so the absence of accreditation is not, by itself, evidence of wrongdoing. What matters more is the complaint pattern.

Billing and Auto-Renewal Complaints

The most common complaint category in the BBB file involves billing disputes, particularly around auto-renewal charges. Subscribers report being charged for a second year before receiving adequate renewal notices. This pattern is consistent with what the FTC has flagged in its updated Negative Option Rule guidance, which requires clear, conspicuous disclosure of subscription terms before a consumer's payment method is charged.

Several women in consumer reviews specifically noted that they enrolled during a promotional period and were surprised to find the renewal price differed from the introductory rate.

Cancellation Difficulty

A second cluster of complaints describes difficulty canceling subscriptions. Multiple reviewers on the BBB profile and on Trustpilot report needing to contact support multiple times or waiting beyond the stated cancellation window. For a subscription that renews annually rather than monthly, a failed cancellation attempt carries a larger financial consequence than it would on a month-to-month service.

Result Interpretation and the Absence of Clinical Follow-Up

This is the complaint category most directly relevant to women's health. Function Health surfaces results through a consumer-facing app, with explanatory text and some AI-assisted interpretation. What it does not provide, as a standard feature of the subscription price, is a one-on-one consult with a clinician who can interpret your specific pattern of results in the context of your age, reproductive status, symptoms, and medications.

The American College of Obstetricians and Gynecologists (ACOG) has noted in the context of direct-to-consumer testing that results without clinical context can cause unnecessary anxiety or, conversely, false reassurance. The same principle applies to biomarker panels.

A woman in perimenopause who sees an FSH of 45 mIU/mL alongside a low-normal estradiol may not know whether that pattern warrants hormone therapy discussion, a repeat test in a different cycle phase, or simply watchful waiting. That clinical nuance is not reliably delivered by an app.

How Function Health's Model Works (and Where It Has Gaps for Women)

Function Health operates as a physician-enabled lab ordering platform. A partnered ordering physician signs off on lab requisitions, satisfying the state-law requirement that labs be ordered by a licensed clinician. This is standard practice in the direct-to-consumer lab industry and does not, by itself, mean you have a treating physician relationship.

The Ordering Physician Is Not Your Doctor

The physician whose name appears on your lab requisition is typically not reviewing your results, is not available for follow-up questions, and does not know your medical history. This is not unique to Function Health. It is a structural feature of the DTC lab model that all consumers, and especially women managing complex hormonal conditions, need to understand before subscribing.

What the Panel Does and Does Not Include

Function Health's flagship panel is large: it covers thyroid (TSH, Free T3, Free T4, TPO antibodies), sex hormones (estradiol, testosterone, SHBG, DHEA-S, progesterone), metabolic markers (fasting insulin, HbA1c, HOMA-IR), inflammatory markers (hsCRP, homocysteine), nutrients (vitamin D, ferritin, B12, folate, magnesium), and more. For a woman trying to get a broad baseline picture of her health, this breadth is genuinely useful.

The gaps appear when you look at life-stage specificity:

• Perimenopause: FSH and estradiol are included, but a single draw in a woman with an intact uterus and irregular cycles can be misleading. The Menopause Society (formerly NAMS) recommends against relying on a single hormone level to diagnose perimenopause; serial testing and clinical history matter.
• PCOS: The panel includes testosterone and SHBG, which is relevant. It does not appear to include LH/FSH ratio as a discrete reportable, or anti-Mullerian hormone (AMH), which Fertility & Sterility guidelines recognize as the most stable PCOS-related ovarian reserve marker across the cycle.
• Pregnancy: No trimester-specific reference ranges are applied. Standard reference ranges for TSH, HbA1c, ferritin, and many other markers differ substantially in pregnancy, as discussed further in the pregnancy section below.
• Postpartum: Postpartum thyroiditis affects an estimated 5 to 10 percent of postpartum women, making TSH monitoring clinically meaningful in the months after delivery. The panel captures TSH, but there is no postpartum-specific protocol or follow-up pathway built into the subscription.

Women's Health Conditions and What Function Health Measures (or Misses)

Thyroid Disease

Women are 5 to 8 times more likely than men to develop thyroid disease across their lifetime. Function Health includes TSH, Free T4, Free T3, and TPO antibodies. This is a more complete thyroid panel than most primary care offices order at a routine visit, and that breadth is one of the service's genuine strengths for women who suspect subclinical hypothyroidism or Hashimoto's thyroiditis.

The limitation: a TSH of 3.8 mIU/L looks "normal" in the app but may warrant discussion if you are trying to conceive, given that ACOG and the American Thyroid Association recommend a preconception TSH target of <2.5 mIU/L in women with thyroid antibodies. An app that flags a value as normal when guidelines recommend a lower target for your specific situation can give false reassurance.

PCOS

Polycystic ovary syndrome affects an estimated 8 to 13 percent of women of reproductive age. The Function Health panel captures several PCOS-relevant markers: free testosterone, SHBG, DHEA-S, fasting insulin, HbA1c, and hsCRP. This is more than a typical annual physical, and for a woman already diagnosed with PCOS, getting these markers tracked annually is reasonable.

What the panel does not address is the diagnostic framework. PCOS diagnosis under the Rotterdam criteria requires two of three features: irregular ovulation, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology on ultrasound. No blood panel alone can diagnose PCOS. A woman who uses a Function Health panel as a self-diagnostic tool and concludes she does or does not have PCOS based on lab values alone is missing a significant portion of the clinical picture.

Perimenopause and Menopause

In perimenopause, estradiol and FSH fluctuate dramatically, sometimes day to day. A single snapshot draw may land on a day when FSH is in the premenopausal range and estradiol looks normal, giving a false sense of where you are hormonally. The Menopause Society is explicit that lab values should not be used as the sole basis for treatment decisions in this transition.

The Function Health panel does include estradiol, FSH, testosterone, and SHBG, which together provide useful information for a postmenopausal woman on stable hormone therapy who wants to track her levels. For a perimenopausal woman with symptoms, the snapshot limitation is worth understanding before you invest $499 expecting answers.

Bone Health and Osteoporosis

Women lose bone density at an accelerated rate in the years surrounding menopause. The Function Health panel includes vitamin D and calcium, which are relevant to bone metabolism, but does not appear to include markers like osteocalcin, bone-specific alkaline phosphatase, or urinary NTX that directly assess bone turnover. The National Osteoporosis Foundation notes that DEXA scan, not blood markers, is the standard for assessing bone density. Women over 50 who are specifically concerned about osteoporosis should not rely on this panel as a substitute for DEXA.

Female Pattern Hair Loss and Hormonal Acne

Both conditions are androgen-influenced and commonly present in women with PCOS, insulin resistance, or thyroid dysfunction. Function Health's panel covers the relevant markers: free testosterone, DHEA-S, SHBG, TSH, and fasting insulin. A woman investigating the root cause of hair loss or persistent adult acne will find useful signal in these values, with the caveat that interpretation still requires a clinician who understands the female-specific androgen physiology.

Pregnancy, Postpartum, and Lactation: Important Limitations

Function Health is not designed for use during pregnancy, and this limitation deserves plain, direct attention.

Pregnancy reference ranges differ substantially from general adult ranges. TSH in the first trimester has a recommended upper limit of 2.5 mIU/L in many institutional guidelines, compared with 4.5 mIU/L in the general population. HbA1c falls naturally in pregnancy due to increased red blood cell turnover, so a "normal" non-pregnant HbA1c threshold does not apply. Ferritin drops as plasma volume expands. Albumin, cholesterol, and many other markers shift substantially across trimesters.

If you are pregnant and use Function Health's app, the reference ranges displayed are almost certainly non-pregnant adult ranges. A result flagged as normal may be abnormal for your trimester, or vice versa.

What to do instead: Prenatal lab monitoring should be managed through your OB-GYN or certified nurse-midwife, using pregnancy-specific reference ranges and clinical protocols. ACOG Practice Bulletin No. 190 and related bulletins govern which labs are ordered and when during pregnancy.

Postpartum: If you are postpartum and considering Function Health to "check everything," be aware that normal ranges for many markers are still in flux for weeks to months after delivery, particularly if you are breastfeeding. Thyroid function, iron stores, and lipid panels all shift postpartum.

Lactation: No evidence suggests the blood draw itself affects milk supply or composition. However, any abnormal result will need clinical follow-up, and the medications sometimes prescribed in response (thyroid replacement, iron infusions, lipid-lowering drugs) carry their own lactation considerations. A Function Health result should be a starting point for a clinician conversation, not a reason to self-treat.

Trying to conceive: If you are actively trying to conceive, the most relevant gap is the likely absence of AMH and a cycle-timed progesterone. ASRM guidelines use day-3 FSH, AMH, and antral follicle count together to assess ovarian reserve. A midluteal progesterone (drawn around day 21 of a 28-day cycle) assesses whether ovulation occurred. Neither of these protocol-specific draws appears to be offered through Function Health's standard annual model.

The Evidence Gap: What We Know and What We Don't

Women have been historically underrepresented in clinical research, and the direct-to-consumer lab industry is even less studied than that. There are no published randomized controlled trials examining health outcomes in women who use Function Health specifically, or DTC lab subscriptions generally, compared with standard-of-care screening.

What we do have is evidence that broad biomarker screening in asymptomatic adults produces a substantial false-positive rate. A panel of 100 tests, each with a 95th-percentile reference range, will produce approximately five "abnormal" results in a completely healthy person by chance alone. This statistical reality means that a broad panel in a well woman will reliably generate anxiety-provoking outliers that require clinical interpretation to contextualize.

The USPSTF has not issued a recommendation specifically on DTC lab subscriptions. Its existing screening recommendations, calibrated by age, sex, and risk factors, are the closest evidence-based framework available for deciding which labs actually matter for you at a given life stage.

Who Function Health May Be a Reasonable Fit For

Function Health is not right for everyone. Here is a life-stage breakdown based on available evidence and the service's actual capabilities.

Postmenopausal women on stable hormone therapy who want annual tracking of estradiol, testosterone, thyroid, metabolic markers, and inflammatory markers may find the broad panel genuinely useful, particularly if their primary care provider only orders a basic metabolic panel and TSH at annual visits.

Women in their 30s and 40s with a PCOS diagnosis who want to track metabolic markers (insulin, HbA1c, hsCRP, testosterone, SHBG) annually and already have an established clinical relationship for interpretation may benefit from the added breadth.

Women with a history of thyroid disease who want to track TSH, Free T3, Free T4, and TPO antibodies more frequently than insurance typically covers may find value.

Who Should Be Cautious or Look Elsewhere

Pregnant women: Do not use this service as your prenatal lab monitoring. Refer to your OB-GYN.

Women actively trying to conceive: The panel is likely missing the cycle-timed, protocol-driven labs that reproductive endocrinology and ASRM guidelines recommend. Work with a reproductive endocrinologist or fertility-aware OB-GYN.

Women who expect a diagnosis or treatment plan from results: The service provides data, not clinical care. If you see an abnormal value, you will need to bring it to a clinician who can act on it.

Women who have difficulty with subscription billing disputes: Given the complaint pattern around auto-renewal, read the terms of service carefully before entering payment information.

How to Get Value from a Broad Lab Panel If You Do Subscribe

If you decide to try Function Health, these steps reduce the risk of confusion or harm:

1. Screenshot or download your results as a PDF immediately after they post.
2. Book a dedicated appointment with your primary care provider, gynecologist, or a women's health NP to review the results together, not as an add-on at the end of a routine visit.
3. Flag any value outside the reference range and ask your clinician whether the reference range applies to your specific life stage, medications, and reproductive status.
4. Do not start, stop, or change any supplement or medication based on an app flag alone.
5. Set a calendar reminder two weeks before your annual renewal date, with a clear decision point: did you use the service, and will you use it again?