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The following classifications and sources of medications must absolutely never be used for transgender HRT. Their risks violently outweigh any theoretical benefits. Even if you are completely cut off from legitimate medical pathways, resorting to these alternatives can inflict permanent, fatal damage.

Banned Medication	Core Danger	Threat Level
Ethinylestradiol (EE)	VTE risk is 6-20x higher than pure E2.	Absolutely Banned
Conjugated Equine Estrogens (Premarin)	Devastating cardiovascular & clot risks.	Absolutely Banned
Medroxyprogesterone Acetate (MPA)	Increases breast cancer & cardiovascular events.	Absolutely Banned
Veterinary Hormones	Uncontrollable doses, unknown excipients, unsterilized.	Absolutely Banned
Homebrew / DIY Injectables	Severe sepsis risk from unsterile kitchen mixing.	Absolutely Banned

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Ethinylestradiol (EE) / Diane-35

Ethinylestradiol — The Ultimate Clot Risk

Ethinylestradiol (EE) is a highly synthetic estrogen primarily used in combined birth control pills (like Diane-35).

Why it is dangerous:

• EE hammers the liver’s coagulation factors, rocketing VTE (blood clot) risks to roughly 6 to 20 times higher than taking standard bioidentical E2 ^{[1] [2]} .
• It directly caused the historically high rates of pulmonary embolisms and deep vein thrombosis seen in early trans healthcare ^[3] .
• WPATH SOC 8 and Endocrine Society 2017 Guidelines universally ban the use of EE in GAHT ^{[4] [5]} .

Birth Control is NOT HRT

Medications like Diane-35 contain 35 μg of EE alongside 2 mg of Cyproterone (CPA). Desperate DIY users frequently take Diane-35 under the delusion that it is a cheap, all-in-one HRT pill. It is not.

• The CPA in the drug is already pro-coagulant. Stacking it with the lethally pro-coagulant EE amplifies the death risk exponentially.
• The feminization power of Diane-35 is incredibly weak compared to standard bioidentical estrogen.

If you are currently taking Diane-35

Switch to oral bioidentical estradiol (Progynova / Estrace) immediately and source your anti-androgens (CPA, Spiro, Bica) separately. Do not cold turkey your blockers without having a replacement plan.

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Conjugated Equine Estrogens (Premarin)

Conjugated Equine Estrogens — High Risk, Low Reward

Conjugated Equine Estrogens (CEE), most famously branded as Premarin, is a cocktail of estrogens extracted from the urine of pregnant mares.

Why it is dangerous:

• The massive Women’s Health Initiative (WHI) study definitively proved that oral CEE significantly spiked cardiovascular events and clot rates ^[4] .
• CEE carries a tremendously elevated VTE risk compared to bioidentical E2 ^[2] .
• The human body cannot predictably metabolize horse-specific estrogen analogues (like equilin).

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Medroxyprogesterone Acetate (MPA / Provera)

MPA — Do Not Use Synethetic Progestins

Medroxyprogesterone Acetate (MPA) is a highly synthetic progestin. It was heavily used in previous decades but has since been largely abandoned by modern medicine regarding HRT.

Why it is dangerous:

• In the WHI study, patients taking CEE + MPA experienced a horrifying spike in invasive breast cancer compared to those just taking CEE ^[4] .
• MPA causes significantly worse blood clot risks compared to natural bioidentical progesterone ^[1] .
• It possesses glucocorticoid activity, meaning prolonged use violently alters your baseline metabolic functions.

If you are currently taking MPA

Demand a prescription for Bioidentical Micronized Progesterone (Prometrium / Utrogestan). You will lose nothing regarding feminization and will drastically lower your cancer and VTE risks.

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Veterinary Hormones

Animal-Grade Hormones — Unknown Formulations, Uncontrollable Doses

In some regions lacking medical access, individuals occasionally resort to agricultural or veterinary hormone medications (such as injectable estrogens intended for livestock reproduction). This practice is catastrophically dangerous.

Why it is dangerous:

• Unknown Estrogens: Veterinary formulas often rely on cheap, hyper-potent synthetic estrogens like diethylstilbestrol (which is heavily regulated or banned in humans due to extreme cancer risks).
• Uncontrollable Dosing: An injectable meant to jumpstart a 2,000-pound cow cannot be safely divided for a human. Microscopic math errors yield massive human overdoses.
• Impure Manufacturing: Agricultural drugs do not adhere to human pharmaceutical standards. They contain impurities, heavy metals, and excipients completely unfit for human biology.
• Sterility Issues: Veterinary injectables lack human-grade sterility safeguards, making bacterial sepsis incredibly likely.

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Unregulated Homebrew (DIY) Injectables

Homebrew Injectables — The Sterility Gamble

Because branded injectable estradiol is frequently expensive or heavily restricted by governments, a massive global “homebrew” market exists. Individuals purchase raw estradiol powder from overseas chemical suppliers and cook their own injectable vials at home.

Why it is dangerous:

• Sterility Failure: Injectables must be formulated in ISO-certified cleanrooms under laminar flow hoods. A kitchen counter cannot achieve this. Injecting contaminated fluid directly into your deep muscle leads to severe abscesses, systemic blood poisoning (sepsis), and potentially death.
• Lack of Purity Verification: “Raw E2 powder” bought from random decentralized suppliers could be cut with literally anything. Without High-Performance Liquid Chromatography (HPLC) testing, you have no idea what you are injecting.
• Toxic Oils & Solvents: Injectable hormones require specific carrier oils (like castor or MCT oil) and solvents (like benzyl benzoate) mixed at precise mathematical ratios. Poor mixing causes the E2 to crash out of the solution into crystals, or triggers severe anaphylactic allergic reactions.
• Pyrogens: Unfiltered homebrews are loaded with pyrogens (endotoxins) that trigger violent, uncontrollable fever responses upon injection.

What to do if DIY is your only option:

If your governmental reality completely cuts you off from legal HRT, do not resort to kitchen-sink injectables. Stick to factory-sealed, commercially manufactured oral pills (like Progynova/Estrace/Estrofem) acquired via the gray market. Oral pills are significantly harder to contaminate and infinitely easier to verify for authenticity compared to random vats of oil.

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References

1. Canonico M et al. Hormone therapy and venous thromboembolism: an updated overview. Climacteric 2018.
2. Vinogradova Y et al. Use of hormone replacement therapy and risk of venous thromboembolism. BMJ 2019.
3. de Blok CJM et al. Amsterdam cohort 50-year follow-up. Lancet Diabetes Endocrinol 2021.
4. Hembree WC et al. Endocrine Treatment of Gender-Dysphoric/Gender-Incongruent Persons. J Clin Endocrinol Metab 2017;102(11):3869-3903. DOI:10.1210/jc.2017-01658
5. Coleman E et al. Standards of Care for the Health of Transgender and Gender Diverse People, Version 8. Int J Transgend Health 2022;23(S1):S1-S259. DOI:10.1080/26895269.2022.2100644
6. Misakian AL et al. Injectable Estradiol Monotherapy in Transgender Individuals. Endocrine Practice 2025.