What Are Amino Acids For? A Complete Guide to Glycine, Lysine, Proline and More
Amino acids are the building blocks of virtually everything your body does: from the neurotransmitters that regulate your mood, to the collagen fibres that hold your skin together, to the enzymes that drive your metabolism, to the compounds that determine how well your cells absorb and utilise hydration.
Glycine: The Quiet Powerhouse
Glycine is the most abundant amino acid in collagen — making up approximately one-third of its structure. It is essential for skin elasticity, joint integrity, and connective tissue health. It also acts as a co-transporter for cellular hydration, helping shuttle sodium and water into cells more efficiently, supports glutathione (the body's primary antioxidant) synthesis, and has been shown to improve sleep quality through its thermoregulatory effects.
L-Lysine: Collagen, Immunity, and Calcium Absorption
An essential amino acid the body cannot make independently. L-Lysine is a critical co-factor in collagen synthesis, working with glycine and proline to form the triple-helix structure of collagen fibres. It also enhances calcium absorption in the gut, supports immune antibody production, and plays a role in energy metabolism.
L-Arginine: Nitric Oxide and Vascular Health
The direct precursor to nitric oxide — the molecule responsible for vasodilation. Improved vascular function means better delivery of oxygen, electrolytes, and nutrients to every cell in the body, making L-Arginine central to both hydration and performance.
L-Citrulline: Sustained Nitric Oxide Production
Works in tandem with L-Arginine to sustain nitric oxide production over a longer period. Because it bypasses first-pass metabolism, it raises plasma arginine levels more effectively than arginine supplementation alone.
L-Proline: The Collagen Stabiliser
The structural backbone of collagen. Without adequate proline, collagen fibres cannot form correctly — affecting skin firmness, wound healing, joint cushioning, and arterial wall integrity.
Glutamine: Gut Integrity and Immune Resilience
The most abundant amino acid in the body and the primary fuel source for gut lining cells and immune cells. Maintains intestinal barrier integrity, supports immune cell proliferation, aids muscle recovery, and contributes to cellular hydration.
Why These Six Amino Acids Are in the SRX No.2 Hydration Formula
Together, Glycine, L-Lysine, L-Arginine, L-Citrulline, L-Proline, and Glutamine support cellular hydration, circulatory delivery, gut integrity, collagen synthesis, and immune resilience — transforming the SRX No.2 Hydration Formula from a simple mineral supplement into a comprehensive cellular hydration system alongside its four-electrolyte matrix.
The Bottom Line
Amino acids are fundamental to how your body repairs itself, circulates nutrients, and keeps every cell properly hydrated. The six in the SRX No.2 Hydration Formula were selected by a UK pharmacist to make hydration work at every level — from the gut to the bloodstream to the cell.