Decreased Sex Drive
Reduced interest in sexual activity, difficulty with arousal
TL;DR
Low libido usually has a findable cause: medication side effects, relationship context, depression, sleep debt, low testosterone or menopause. Antidepressants are one of the most common and most overlooked culprits. Supplements help at the margins; identifying the cause helps far more.
Overview
Low libido is common and usually multifactorial: stress, poor sleep, relationship factors, alcohol, depression and medications — especially SSRI antidepressants and hormonal contraceptives — account for more cases than hormone deficiency. In men, persistently low desire with fatigue or erectile changes warrants a testosterone blood test; in women, thyroid function and iron status are worth checking. Testosterone-boosting supplements are largely unsupported and some are contaminated; the best-evidenced steps are sleep, exercise, alcohol reduction and addressing relationship and mental health factors.
Common Symptoms
- •Reduced interest in sexual activity
- •Fewer sexual thoughts or fantasies
- •Reduced responsiveness to a partner's initiation
- •Distress about the change — the feature that makes it clinically relevant
- •Associated fatigue or low mood
- •Vaginal dryness or erectile difficulty alongside
Common Causes
- •SSRIs and other antidepressants
- •Hormonal contraception in some women
- •Depression, anxiety and chronic stress
- •Chronic sleep deprivation
- •Low testosterone in men
- •Menopause and falling oestrogen
- •Relationship difficulties
- •Alcohol, chronic illness and beta blockers
Root Causes
Sexual desire depends on the interaction of hormonal signalling, dopaminergic reward pathways, and psychological and relational context. Serotonergic medication dampens dopaminergic drive, which is why SSRIs so commonly reduce libido. Testosterone supports desire in both sexes, and falling oestrogen after menopause affects both desire and comfort. Fatigue and stress suppress the whole system independently of hormones.
How It's Diagnosed
Diagnostic Markers
- Morning total and free testosterone in men, on two separate occasions
- Thyroid function
- Prolactin, where libido loss is marked
- Full blood count, ferritin and vitamin D for fatigue causes
- Depression screening
- Medication review — often the highest-yield step
When to See a Doctor
See a doctor if low libido is persistent, distressing, or comes with fatigue, low mood, erectile difficulties, irregular periods, or symptoms after starting a medication such as an SSRI. Blood tests for testosterone (in men), thyroid function and ferritin are reasonable first steps. Sudden loss of desire with other hormonal symptoms warrants prompt assessment.
Supplements Studied For This
Maca Root
Maca improves self-reported sexual desire in small trials and helps SSRI-induced sexual dysfunction at 3 g/day — while leaving every measured sex hormone unchanged.
Ashwagandha
Small positive trials in stressed populations; effects are modest and likely work via cortisol rather than directly on libido.
Tribulus Terrestris
Small trials show real score improvements, but effect sizes are moderate, extracts differ widely, and hormone-mediated explanations do not hold up.
Horny Goat Weed
Traditional use and animal data only — no quality human trials.
Damiana
Pleasant, traditional and cheap, but there is no trial of damiana alone. Treat any effect as unproven and address the common medical and relational causes of low desire first.
Diet & Lifestyle
Suggested Pattern
No specific diet raises libido, but the cardiovascular pattern matters: erectile function depends on endothelial health, so a Mediterranean diet has genuine indirect support. Correcting iron deficiency, vitamin D insufficiency and inadequate calorie intake addresses the fatigue that so often underlies reduced desire. Alcohol reduction helps more than most supplements.
Eat more
- Oily fish and olive oil for endothelial function
- Leafy greens and beetroot for dietary nitrates
- Zinc sources — shellfish, meat, pumpkin seeds
- Adequate total calories; under-eating suppresses sex hormones
- Iron-rich foods where deficiency is present
Avoid
- Excess alcohol — a direct suppressor of desire and function
- Chronic severe calorie restriction
- Ultra-processed diets that impair vascular health
Supporting Research
Effect of ArginMax on sexual functioning and quality of life among female cancer survivors: results of the WFU CCOP Research Base Protocol 97106
Maca (L. meyenii) for improving sexual function: a systematic review
Evaluation of the efficacy and safety of Tribulus terrestris in male sexual dysfunction-A prospective, randomized, double-blind, placebo-controlled clinical trial
Ethnobotany, Phytochemistry and Bioactivity of the Genus Turnera (Passifloraceae) with a Focus on Damiana - Turnera diffusa
Pharmacological actions of the bioactive compounds of Epimedium on the male reproductive system: current status and future perspective
Frequently Asked Questions
Who It Affects
Low sexual desire with associated distress affects roughly 10 per cent of women and 8 per cent of men, with prevalence rising with age and medication use.
More frequently reported by women, particularly around the menopausal transition. In men it rises with age alongside gradually declining testosterone and increasing medication burden.
Quick Facts
- •SSRI antidepressants reduce libido in roughly 30-50% of users
- •Low testosterone affects an estimated 2-5% of men under 40, rising with age
- •Most over-the-counter testosterone boosters show no effect in controlled trials
- •Regular moderate exercise improves sexual function in both men and women
- •Heavy alcohol use suppresses testosterone; even moderate intake can blunt arousal
Lifestyle Tips
- •Review medications with your prescriber before anything else — SSRIs are the classic cause
- •Treat sleep debt; testosterone drops measurably after a week of short sleep
- •Exercise regularly, which improves both mood and vascular function
- •Address relationship and communication factors honestly — these are frequently the main driver
- •Reduce alcohol
- •Consider psychosexual therapy, which has better evidence than most supplements
Related Topics
My Notes
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.