Topic
Hormones, thyroid and fertility
Sex hormones, thyroid tests, and pregnancy and sperm measures.
This page is not a ranking. Ingredients appear in order of how much we have read here.
The 15 things measured here · ingredients read against each
- Total testosterone 5
- Free testosterone 3
- Sex hormone binding globulin 3
- Thyroid-stimulating hormone (TSH) 3
- Estradiol 2
- Free thyroxine (fT4) 2
- Growth Hormone (Somatotropin) 1
- Neural Tube Defect Risk 1
- Pre-eclampsia incidence 1
- Prolactin 1
- Sperm concentration 1
- Thyroid Peroxidase Antibodies (TPOAb) 1
- Thyroid Volume (ultrasound) 1
- Total sperm motility 1
- Total Thyroxine (Total T4) 1
Read here so far: 27 questions across 11 ingredients
Boron
- Boron and Free testosteroneTwo sources, saying different thingsLow certainty, level 2 of 4
- Boron and Total testosteroneTwo sources, saying different thingsLow certainty, level 2 of 4
- Boron and EstradiolTwo sources, saying different thingsVery low certainty, level 1 of 4
- Boron and Sex hormone binding globulinOne source, measured lowerVery low certainty, level 1 of 4
Iodine
- Iodine and Thyroid-stimulating hormone (TSH)Two sources, all found no clear difference, and one source carries a noticeLow certainty, level 2 of 4
- Iodine and Free thyroxine (fT4)One source, found no clear differenceLow certainty, level 2 of 4
- Iodine and Thyroid Volume (ultrasound)One source, measured lowerLow certainty, level 2 of 4
- Iodine and Total Thyroxine (Total T4)One source, measured higherLow certainty, level 2 of 4
Tongkat Ali
- Tongkat Ali and EstradiolOne source, measured higherLow certainty, level 2 of 4
- Tongkat Ali and Sex hormone binding globulinOne source, found no clear differenceLow certainty, level 2 of 4
- Tongkat Ali and Total testosteroneOne source, measured higherLow certainty, level 2 of 4
- Tongkat Ali and Free testosteroneOne source, measured higherVery low certainty, level 1 of 4
Ashwagandha
- Ashwagandha and Total testosteroneOne source, measured higherModerate certainty, level 3 of 4
- Ashwagandha and Thyroid-stimulating hormone (TSH)One source, measured lowerLow certainty, level 2 of 4
- Ashwagandha and Free thyroxine (fT4)One source, measured higherVery low certainty, level 1 of 4
Myo-inositol
- Myo-inositol and Free testosteroneOne source, measured lowerLow certainty, level 2 of 4
- Myo-inositol and Sex hormone binding globulinOne source, measured higherLow certainty, level 2 of 4
- Myo-inositol and Total testosteroneOne source, measured lowerLow certainty, level 2 of 4
Selenium
- Selenium and Thyroid Peroxidase Antibodies (TPOAb)One source, measured lowerModerate certainty, level 3 of 4
- Selenium and Thyroid-stimulating hormone (TSH)One source, measured lowerModerate certainty, level 3 of 4
- Selenium and Sperm concentrationOne source, measured higherLow certainty, level 2 of 4
Beta-Alanine
- Beta-Alanine and Growth Hormone (Somatotropin)One source, found no clear differenceLow certainty, level 2 of 4
- Beta-Alanine and Total testosteroneOne source, found no clear differenceLow certainty, level 2 of 4
5-HTP
- 5-HTP and ProlactinOne source, measured higherLow certainty, level 2 of 4
Calcium
- Calcium and Pre-eclampsia incidenceOne source, found no clear difference, and one source carries a noticeModerate certainty, level 3 of 4
Folate
- Folate and Neural Tube Defect RiskOne source, measured lower, and one source carries a noticeModerate certainty, level 3 of 4
L-Carnitine
- L-Carnitine and Total sperm motilityOne source, measured higherLow certainty, level 2 of 4
Where the sources say different things
Every side in full, because one line would have to pick one of them.
Boron and free testosterone
Two sources here, and they say different things: one measured higher free testosterone and one found no clear difference.
No number has been put on this yet.
Boron and total testosterone
Two sources here, and they say different things: one measured higher total testosterone and one found no clear difference.
No number has been put on this yet.
Boron and estradiol
Two sources here, and they say different things: one measured lower estradiol and one measured higher.
No number has been put on this yet.
How much of this is one source
Read from 22 sources. 23 of the 27 questions here rest on a single source with nothing yet to check them against, and on 3 questions the sources say different things.
What is still to read is kept per ingredient, not per topic, so every ingredient named above carries its own list.
Still to read means nobody here has got to it, not that it was tried and did nothing or that no research exists. A pairing on no list is not a gap: we never set out to read it.
The other 14 topics
- Sleep28 questions · 11 ingredients
- Mood, stress and thinking33 questions · 17 ingredients
- Heart and blood pressure49 questions · 23 ingredients
- Cholesterol and blood fats65 questions · 24 ingredients
- Blood sugar and insulin45 questions · 20 ingredients
- Inflammation and oxidative stress37 questions · 21 ingredients
- Energy and exercise26 questions · 17 ingredients
- Joints, muscles and pain18 questions · 16 ingredients
- Bone strength10 questions · 6 ingredients
- Liver, kidney and digestion22 questions · 14 ingredients
- Skin, hair and nails7 questions · 4 ingredients
- Vitamin and mineral levels15 questions · 9 ingredients
- Body weight and composition16 questions · 11 ingredients
- Long-term health and immunity20 questions · 17 ingredients
This is a library, not advice. No recommendation, no dose, no diagnosis, no ranking. We never ask about your symptoms, and nothing here is tailored to you.