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Usually, non-hormonal shrinkage of the penis is pretty rare and non permanent. While an increase in fat around the pubic region can give an impression of apparent shrinkage, forming gradual changes due to natural aging may have their say as well. Surgical removal or reduction options do exist but are usually employed in gender-affirming treatment as opposed to just purely cosmetic methods.
A better way to shrink your penis is by hormone therapy with estrogen and anti-androgens like cyproterone acetate, spironolactone, or GnRH agonists can cause hormonal shrinkage. Over time, this treatment reduces testosterone into the female range, which results in smaller testicles, fewer spontaneous erections, a softer, less veined appearance, and a decrease in the volume of erectile tissue. Usually partial, shrinkage affects both length and girth but never completely disappears. Because self-administering hormones can jeopardize bone density, heart health, and fertility, proper medical supervision is crucial. Unless treatment is discontinued early, changes that take place gradually over months or years are generally permanent.
Sources:
pubmed.ncbi.nlm.nih.gov
www.endocrine.org
en.wikipedia.org
A better way to shrink your penis is by hormone therapy with estrogen and anti-androgens like cyproterone acetate, spironolactone, or GnRH agonists can cause hormonal shrinkage. Over time, this treatment reduces testosterone into the female range, which results in smaller testicles, fewer spontaneous erections, a softer, less veined appearance, and a decrease in the volume of erectile tissue. Usually partial, shrinkage affects both length and girth but never completely disappears. Because self-administering hormones can jeopardize bone density, heart health, and fertility, proper medical supervision is crucial. Unless treatment is discontinued early, changes that take place gradually over months or years are generally permanent.
Sources:
Long-term evaluation of cross-sex hormone treatment in transsexual persons - PubMed
Cross-sex hormone treatment appears to be safe in transsexual men. On the other hand, a substantial number of transsexual women suffered from osteoporosis at the lumbar spine and distal arm. Twelve percent of transsexual women experienced thromboembolic and/or other cardiovascular events during...
pubmed.ncbi.nlm.nih.gov
Gender Dysphoria/Gender Incongruence Guideline Resources
The 2017 Endocrine Treatment of Gender-Dysphoric/Gender-Incongruent Persons is an update to the 2009 version, which establishes and standardizes the terminology and safe treatment of gender dysphoric/gender-incongruent persons and reaffirming the role of endocrinologists.
