As 20 ng/dL is not in a very lower side, Try to get adequate doses through diet and sunlight.
And about using Tentex Forte , One Tablet Daily is okay if it has been prescribed by your doctor. However consult with your doctor once again if you are using it for a long time or STOP it if you are using it as recreational medicine.
Get Well Soon! 💐
Namami Dhanvantari ! Jai Ayurved
Regards
Dr. Shubham Prakash Sahu
for ShubhArogyam™
Next Steps
Consult with your Ayurvedacharya.
Health Tips
Don't use Tentex Forte as a recreational Drug.
You can always go for learning proper lovemaking techniques or Consult with your Sexologist if you have worries.