B12 shots and NAD+ injections
Each occupies a different point on the price-and-strength spectrum, and we compare representative options in the table below
A 2025 matched-cohort study found men who started testosterone therapy had significantly higher rates of tendon tears and repairs at one and two years compared to controls, a pattern the authors attributed to testosterone's effect on tendon biomechanics outpacing the tissue's regenerative capacity Sherman et al
Structure and Function of Glutathione S-Transferases: 9780849345821: Medicine & Health Science Books @ Amazon.com
Sever et al., 2019), thus avoiding and directly counteracting VEGF tumorigenesis (Radeljak et al., 2004)
The timeline varies based on starting dose, escalation speed, and individual factors like dietary habits and hydration status