What is collagen?
Collagen is the most abundant protein in the human body and plays a vital role in the structure of skin, hair, and nails. It’s also an essential building block for keratin, which strengthens our hair. Unfortunately, the body’s natural collagen production declines with age – and this can affect both skin and hair.
Effects of Collagen on Hair
There are few direct human studies that have specifically examined the effects of collagen on hair growth or hair density.
Most findings are based on indirect effects or animal models. More independent, large-scale studies are needed to make clear, evidence-based conclusions.
Nevertheless, collagen may potentially support hair growth, primarily by improving skin and scalp health and by providing essential amino acids. When combined with other nutrients such as spermidine, biotin, or zinc, it often forms a sensible, holistic approach to supporting skin and hair.
What Do Studies Say About Collagen and Hair?
- Indirect Benefits for Hair Growth
- Collagen is rich in amino acids like proline, one of the building blocks of keratins, which make up hair.
- Studies suggest that collagen intake may support keratin production, which could potentially promote hair growth.
- Antioxidant Effects
- Collagen can reduce oxidative damage caused by free radicals. Oxidative stress is a factor in hair loss and premature aging of hair follicles.
- An animal study (Takanashi et al., 2019) showed that collagen can improve antioxidant capacity in the skin and hair follicles.
- Improved Skin Health → Better Scalp
- Studies (e.g., Proksch et al., 2014) show that collagen improves skin elasticity and moisture—which is also beneficial for the scalp, and a healthy scalp is the foundation for healthy hair.
- Possible Delay of Graying:
- Some studies suggest that collagen may help increase antioxidant activity in hair follicles—which could potentially delay graying.
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Spermidine is a natural polyamine
that promotes skin and hair health.
Spermidine is a naturally occurring substance found in all cells and plays an important role in cell regeneration and the process called autophagy – the “self-cleaning” of cells. Regarding hair health, spermidine is considered a promising agent because it can extend the lifespan of hair follicles and promote hair growth. Studies suggest that spermidine supports growth during the anagen phase (the active growth phase) of hair, leading to stronger and healthier hair regrowth. Especially in cases of age-related hair loss or stress-related weakening of hair structure, targeted supplementation with spermidine – for example through dietary supplements – may have a supportive effect. It is important to use it long-term, as positive effects usually become visible only after several weeks.
Biohacking Beauty: The Anti-Aging Skincare Podcast
We’re excited to share a special podcast collaboration. In this episode, Dr. Melissa Cano dives into the science of spermidine and skin health, exploring how this powerful polyamine supports skin cell renewal, strengthens the barrier function, and promotes elasticity and resilience with aging.
