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SYMPTOMS

Low libido

Everyday reasons for low libido, what to ask your doctor to check, and which nutrients have been studied.

Also described as: libido, sex drive, no desire, low desire, erectile, erection

Common everyday causes

Low testosterone

Testosterone falls with age, weight gain, poor sleep and some medicines; low levels mean low desire, low energy and low mood. Ask for a morning total testosterone test (repeat it if low).

Stress load (your stress response on overdrive)

Ongoing stress keeps cortisol and adrenaline up: wired-but-tired, poor sleep, cravings, gut upset, shedding and lower libido. No routine test is reliable (a morning cortisol is only a snapshot).

Hormone shifts of perimenopause and menopause

Falling and swinging estrogen drives hot flashes, night waking, mood changes and lower libido, usually from the early 40s. Diagnosis is by symptoms and cycle changes; hormone tests swing too much to rely on. Ask your doctor about hormone therapy or non-hormonal options.

Not enough restorative sleep

Under 7 hours, or broken sleep, lowers energy, focus, mood and immune defenses and raises cravings the next day. No test. Track sleep for a week; see a doctor if it lasts more than 3 months (CBT-I is first-line).

Low zinc

Zinc runs immune cells, skin repair and hair growth. Plant-based diets, acid reducers and gut conditions lower it. Ask for a plasma zinc test.

Possible sleep apnea

Pauses in breathing at night fragment sleep, so you wake unrefreshed however long you sleep. Loud snoring is the main clue. Supplements don’t treat it. Ask your doctor about a sleep study (home tests are common).

If you take certain medicines

The pill lowering B6, folate and magnesium

Hormonal contraceptives lower B6, folate, B12, magnesium and zinc and raise the protein that binds testosterone (lower libido for some). Ask for B6, folate and magnesium tests if symptoms started with the pill.

What’s been studied

• Vitamin D3

  For low testosterone.

• Rhodiola

  For stress load.

• Vitamin E

  For menopause transition.

• Glycine

  For menopause transition.

• L-theanine

  For stress load.

• Zinc

  For low testosterone.

• Vitamin B6

  For the pill.

• Methylfolate

  For the pill.

• Magnesium

  For stress load.

From the Journal

• Magnesium glycinate vs citrate vs oxide: which form should you take?

  Glycinate, citrate, oxide, malate, threonate and taurate compared on magnesium content, absorption, gut comfort and capsule space, plus the 350 mg supplement limit and medicine timing.

• Which supplements interact with common medications?

  The best-documented supplement and medicine interactions, from vitamin K and warfarin to St. John's wort, minerals and thyroid medicine, and 5-HTP with SSRIs.

• Which supplements help you sleep? What the research shows

  Magnesium, L-theanine, melatonin, saffron, glycine and tart cherry: what the trials found, the doses studied, and when poor sleep is a reason to see a doctor instead.

• What is functional medicine, and how does it use supplements?

  What functional and integrative medicine mean, how practitioners use history and labs to choose supplements, and how to judge the evidence and the marketing yourself.

apiece asks a few quick questions about low libido in its quiz to tell these causes apart, and suggests only ingredients studied for the likely ones.

Questions

What can cause low libido?

Common everyday reasons include low testosterone, stress load, menopause transition, sleep debt, low zinc. A doctor can help find which applies to you.

What tests can help explain low libido?

Ask your doctor about: a morning total testosterone test (repeat it if low); No routine test is reliable (a morning cortisol is only a snapshot); Diagnosis is by symptoms and cycle changes; hormone tests swing too much to rely on. Ask your doctor about hormone therapy or non-hormonal options; No test. Track sleep for a week; see a doctor if it lasts more than 3 months (CBT-I is first-line); a plasma zinc test; Ask your doctor about a sleep study (home tests are common).

Which supplements are studied for low libido?

Depending on the cause: Vitamin D3, Rhodiola, Vitamin E, Glycine, L-theanine, Zinc, Vitamin B6, Methylfolate, Magnesium. Some only make sense with a lab result (for example iron only when ferritin is low).*

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.