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Ferrous Bisglycinate
Test ferritin before you touch iron. No number, no tablet.
Fenugreek
Buy fenugreek for your blood sugar, and stop buying it for your testosterone.
Fasting-Mimicking Diet
Run the five-day version at near-zero protein, or you're just eating less.
Fadogia agrestis
Skip Fadogia. The testosterone came from rats, and so did the testicular damage.
Extraction of Root-Canal-Treated Teeth
Keep the tooth. Retreat it if it's infected, don't let anyone pull a sound one.
Exogenous Ketones
Skip the ketone drink. The only thing it reliably buys is a higher meter reading.
Evolocumab vs. Alirocumab
Take whichever one your insurer covers. The two finish level.