I am a 31 year old male who had, until recently, never used steroids as I felt my results were fine as they were. However, in the last year I have developed many nagging aches and pains and finally succumbed to trying deca. I have been using it for 5 weeks and have noticed some minor improvements both in the pain I was experiencing and in my strength. The person who provided me with the deca has now told me I should add a small dose of testosterone as well since using just deca could affect my libido. Is this true? If so, how much should I take since I am not looking to make any significant gains in size?