Data were analysed by: Students unpaired t-test ( b,c,d,e, j )
Younger people can also become deficient, particularly if they don't eat a balanced, nutrient-rich diet
[6] [10] You should arrange a GP appointment if you experience: Persistent difficulty achieving or maintaining erections sufficient for sexual activity Sudden onset of erectile problems, especially if accompanied by other symptoms Reduced libido or changes in sexual desire Pain during erection or intercourse Concerns about fertility or reproductive health Psychological distress related to sexual function Your GP will conduct a thorough assessment including medical history, medication review, and examination
Supplied in freeze-dried (lyophilised) form to support long-term storage and controlled research preparation
This is why week 1 tolerance is a poor predictor of week 5 tolerance, and why the trial ladder holds each step for a full 4 weeks rather than 1 or 2