2mg a week might be enough for minor maintenance, but if you’re dealing with an actual injury, you need to understand the loading phase protocol for Thymosin Beta-4.
Most clinical data suggests a saturation phase of 4-6mg per week (split into two 2-3mg pins) for the first 3-4 weeks. This ensures that the actin-sequestering levels in the tissue are high enough to actually initiate the repair cell migration. After that initial month, dropping down to a 2mg "maintenance" dose once a week makes much more sense.
Also, keep an eye on your injection technique. Since TB-500 is systemic, you don't have to pin the injury site, but doing it sub-q in a lean area ensures better absorption than pinning into deep adipose tissue where blood flow is lower.