Are you getting enough vitamin B12
You may experience tingling sensation due to the plumping effect depending on the state of your lips, which is common for lip plumping products (caused by Vanillyl Butyl Ether)
Similarly, a Polish questionnaire-based study involving 179 gym users in Wrocaw reported that 35.2% of respondents had used testosterone or other anabolicandrogenic substances ( The reviewed literature consistently demonstrates that anabolicandrogenic steroid use is associated with a wide spectrum of adverse effects, encompassing cardiovascular, neuropsychiatric, hepatic, endocrine, and reproductive systems
The number of days a pen lasts depends on your current dose: 0.6mg dose: 30 days per pen 1.2mg dose: 15 days per pen 1.8mg dose: 10 days per pen 2.4mg dose: 7 days per pen 3.0mg dose: 6 days per pen At the full 3.0mg maintenance dose, you will need approximately 5 pens per month
100 NeedhamB
Stuart (US authors) Very comprehensive with lots of case studies