High SHBG and hormone optimization: what the evidence says

What's this video probably claiming?

Based on the caption and hashtags, @cheriejennings1 is likely walking viewers through the idea that elevated sex hormone-binding globulin (SHBG) is not a standalone problem but rather a downstream signal of fixable upstream issues. The framing, "fixing thyroid, stress, insulin, estrogen balance, and testosterone," suggests a functional-medicine-adjacent argument that addressing those variables will lower SHBG and make hormones more biologically available. The hashtags for bioidentical hormones and testosterone for women signal this is aimed at perimenopausal or postmenopausal women who feel undertreated by conventional care. That audience is real, their frustration is legitimate, and some of what this creator is probably saying has genuine clinical grounding. The question is whether the solution looks as clean and correctable as a short-form video implies.

What does the science actually show?

SHBG is a glycoprotein produced primarily in the liver, and its levels are genuinely regulated by the factors this video names. Thyroid hormone increases SHBG synthesis: hyperthyroidism raises levels, and hypothyroidism suppresses them, a relationship documented in studies like Hollowell et al. (2002, Journal of Clinical Endocrinology and Metabolism). Insulin resistance suppresses SHBG, with large epidemiological data from Ding et al. (2007, Diabetes) showing that each standard deviation increase in fasting insulin corresponded to roughly 20-30% lower SHBG. Estrogens, particularly oral estradiol, substantially raise SHBG compared to transdermal routes, a clinically meaningful difference shown in a 2007 Canonico et al. paper in Circulation. So the causal arrows the video is probably drawing are not invented. They exist. The problem is directionality and magnitude: correcting one variable rarely produces a predictable SHBG shift in a given patient, and "optimal" SHBG ranges are contested even in the endocrinology literature.

Where does the social media noise diverge from clinical reality?

The phrase "optimal zone" is where things get slippery. There is no universally agreed "optimal" SHBG range for women, particularly postmenopausal women on hormone therapy. Reference ranges vary by lab and by assay method. More importantly, SHBG is not purely an obstacle. It buffers against androgen excess, modulates cellular signaling independently of hormone binding, and its own receptors have been identified in tissues including breast and prostate. Treating it as simply a barrier to hormones "working for you" flattens that complexity. The bioidentical hormone hashtag is also worth noting: the claim that bioidentical hormones behave differently from conventional hormone therapy because of SHBG binding is not supported by comparative pharmacokinetic data in the way proponents often argue. A 2020 review by Pinkerton et al. in Menopause was direct: compounded bioidenticals lack the safety and efficacy data of FDA-approved options. Videos in this space routinely imply otherwise.

What should you actually know?

If your provider flagged elevated SHBG, that is worth a conversation, not a self-directed hormone optimization protocol built from TikTok. Clinically, SHBG is most useful in context: paired with total testosterone, free testosterone calculated or measured by equilibrium dialysis, and symptoms. A 2022 Endocrine Society position statement reinforced that free testosterone calculated from total testosterone and SHBG using the Vermeulen equation is a reasonable proxy when direct assays are unavailable, but noted significant inter-assay variability at low concentrations typical in women. Lifestyle factors like resistance training, reducing refined carbohydrate load, and managing thyroid status can influence SHBG, and those interventions carry low risk. Jumping to testosterone therapy or aggressive estrogen manipulation to chase an SHBG number, without clinical supervision, carries real risk and is not supported as a first-line approach. This video may be directionally reasonable in places. It is not a treatment plan.