Tendonitis is caused by inflammation of the tendon, usually caused by repetitive motions and overuse (1). Although research is lacking on the exact effect that marine collagen has on tendonitis, consuming adequate amounts of collagen can help to improve the overall health of your connective tissue. Tendons are primarily comprised of collagen and, therefore, require sufficient collagen to remain healthy, flexible and strong (2). It is understood that the consumption of glycine (found in high concentration in Landish marine collagen) is associated with enhanced collagen production in the body (3). Glycine has also been shown to have a protective effect on inflammation, as it suppresses the formation of free radicals and inflammatory cytokines, which could help to improve tendonitis by minimizing inflammation (4).
References:
Bisciotti, G. N., & Volpi, P. (2016). Tendonitis, Tendinosis, or Tendinopathy? In G. Bisciotti & P. Volpi (Eds.), The Lower Limb Tendinopathies: Etiology, Biology and Treatment (pp. 1–19). Springer International Publishing.
Buckley, M, Evans, E, et al (2013). Distributions of Types I, II and III Collagen by Region in the Human Supraspinatus Tendon.
De Paz-Lugo, P, et al (2018). High glycine concentration increases collagen synthesis by articular chondrocytes in vitro: acute glycine deficiency could be an important cause of osteoarthritis.
Zhong, Z, Wheeler, M, et al (2003). L-Glycine: a novel antiinflammatory, immunomodulatory, and cytoprotective agent.