Gluconolactone
A Polyhydroxy Acid / PHA.
Gluconolactone provides gentle surface exfoliation while also acting as a humectant.
It helps support:
Smoother texture + improved radiance + hydration + softer skin.
Because PHAs generally have larger molecular structures than traditional AHAs such as Glycolic Acid, they are commonly incorporated into formulas intended for more sensitive skin.
Maltobionic Acid
A second Polyhydroxy Acid with both exfoliating and humectant properties.
Maltobionic Acid helps support:
Gentle surface renewal + hydration + smoother texture + improved visible clarity.
Within PHA Tonic, it complements Gluconolactone rather than turning the product into a high-strength peel.
Lactic Acid
An Alpha Hydroxy Acid providing additional surface-renewal support.
Lactic Acid also has humectant properties, making it particularly appropriate in a tonic intended to exfoliate while preserving moisture.
No finished-product concentration is currently published, so I would not assign a percentage.
Glycerin
A well-established humectant that attracts water and helps maintain hydration.
It appears high in the formula, reinforcing the tonic's moisture-supportive positioning.
Betaine
A humectant and osmolyte helping support:
Hydration + softness + reduced tightness.
It complements the acid system by helping maintain skin comfort.
Trehalose
A moisture-binding sugar that helps support hydration and resilience during environmental or dehydration-related stress.
Xylitylglucoside + Anhydroxylitol + Xylitol
A three-part sugar-derived hydration system.
Together, these ingredients help support:
Water retention + softness + improved moisture balance.
For Chris & Alley, I would describe this simply as a:
Xylitol-derived hydration complex.
Allantoin
A soothing skin-conditioning ingredient that helps support comfort and softness.
It is particularly useful in a leave-on exfoliating product intended for more sensitive skin.
Importantly, Allantoin is not an amino acid.
Arginine + Lysine + Histidine + Aspartic Acid + Threonine + Serine + Glutamic Acid + Proline + Glycine + Alanine + Valine + Methionine + Isoleucine + Leucine + Tyrosine + Phenylalanine + Cysteine
A broad amino-acid complex providing complementary hydration and skin-conditioning support.
These ingredients help reinforce the formula's emphasis on softness and moisture balance rather than aggressive exfoliation alone.

Use after cleansing.
Spray directly onto clean, dry skin using the atomiser.
Gently pat over the face + Neck + Chest until fully absorbed.
Do not rinse.
Current NTRYMED guidance supports use morning and evening.
If you are new to leave-on acids or your skin is highly reactive, begin with:
Once daily or every second day and increase according to tolerance.
Avoid direct contact with the eye area.

Sensitive skin
Sensitised skin where acids are tolerated
Compromised-feeling skin requiring gentle renewal
Dry skin
Dehydrated skin
Normal skin
Combination skin
Oily skin requiring gentler exfoliation
Dull or lacklustre skin
Rough or uneven skin texture
Uneven-looking tone
Fine surface dehydration
Skin requiring gentle leave-on exfoliation
Clients who find stronger AHA/BHA toners too aggressive
Pigmentation-focused routines
Age-prevention routines
Face, neck and chest
For acutely irritated, broken or severely compromised skin, wait until the barrier is comfortable before introducing leave-on acids.