The evidence
Each criterion with what we found, where we found it and when. Anything we could not confirm says so.
NTH criteria
NTH Framework v1.2. Score 45.0 (raw 34.0 of 100), calibrated so the best hotel in this edition (Santa Monica Proper Hotel) reads 90. Evidence retrieved 2026-10-22.
Sleep0.0 / 24
The room as an instrument for deep, uninterrupted, circadian-aligned rest.
Mattress & sleep system
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Bedding & textiles
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
Sleep programme & pillow menu
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Blackout
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Circadian & warm evening lighting
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
In-room red light
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Acoustic quiet
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
EMF & Wi-Fi-off options
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Air0.0 / 12
What you breathe for eight hours a night: filtered, fresh, smoke-free and unperfumed.
In-room purification
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Ventilation & building standard
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Smoke-free policy
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Fragrance-free & low-allergen rooms
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Water0.0 / 12
Clean water to drink, and to shower and bathe in.
Filtered drinking water
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Shower & bath filtration
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Gentler pool & hydrotherapy water
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Nourishment5.0 / 10
Food and drink that heal rather than merely please.
Organic & local sourcing
Hotel-reported · across the property
Arva: fresh, organic ingredients at its core; organic produce sourced from the local community.
Clean-ingredient standard
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Clean minibar & in-room hydration
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Nutrition guidance
Hotel-reported · across the property
Personalised nutrition plans and nutrition coaching within Immersions.
Movement8.0 / 10
The means to train, stretch and move, indoors and out.
Gym completeness
Hotel-reported · across the property
Glass-walled, sea-view gym with personal trainers; equipment and hours not published.
Classes & studios
Hotel-reported · across the property
Pilates and yoga studios; daily movement classes included in every stay.
Swimming
Hotel-reported · across the property
Private swimming pools in pool pavilions and villas.
Outdoor activity
Hotel-reported · across the property
Beach boot camps, Muay Thai ring, floodlit tennis and padel courts, rainforest treks.
Holistic Wellness18.0 / 19
Healing traditions and the recovery technology that complements them.
Spa facility
Hotel-reported · across the property
Holistic Wellness Centre: 12 treatment rooms, steam room and infrared saunas.
Traditional & integrative modalities
Hotel-reported · across the property
Thai healing arts, Traditional Chinese Medicine (acupuncture, moxibustion, cupping, herbal remedies), physiotherapy.
Mind & breath
Hotel-reported · across the property
Meditation and mindfulness coaching by in-house specialists.
Heat therapy
Hotel-reported · across the property
Infrared saunas.
Cold therapy
Hotel-reported · across the property
Cryotherapy (medical services); cold plunge pool.
Photobiomodulation & PEMF
Hotel-reported · across the property
PEMF within the Firming & Toning programme.
Clinical longevity (IV, HBOT, diagnostics)
Hotel-reported · across the property
IV therapy (vitamin C, NAD+, ozone), diagnostic screening, regenerative treatments.
Materials & Setting3.0 / 13
What touches the skin and surrounds the stay: finishes, products, cleaning, and the landscape beyond the door.
Natural, low-VOC finishes
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Clean bath & body amenities
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Non-toxic spa & nail products
Hotel-reported · across the property
Aman Skincare, positioned on natural ingredients; formulation not disclosed.
Non-toxic housekeeping & plastic-free operations
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Green & blue space
Hotel-reported · across the property
Private peninsula above a white-sand beach on the Andaman Sea.
Walkability & low-impact mobility
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Our review
At a glance
- Fragrance
- 5 not yet reviewed
- Air
- 1 hotel-reported, 4 not yet reviewed
- Cleaning & care
- 4 not yet reviewed
- Sleep & materials
- 5 not yet reviewed
- Water & pools
- 1 hotel-reported, 3 not yet reviewed
- Food
- 1 hotel-reported, 1 not yet reviewed
- Light & quiet
- 2 not yet reviewed
- Building
- 3 not yet reviewed
One reported by the hotel; the rest not yet reviewed.
1 hotel-reported24 of 25 not yet reviewed
Counts cover the 25 scored criteria; the other 5 windows are context.
Checked
Read the full profileThe ledger
Fragrance
Added scent is the most common complaint from sensitive guests, and the hardest thing to see on a booking page.
No added fragrance in rooms
Not yet reviewed.
No scent marketing
Not yet reviewed.
Fragrance-free laundry
Not yet reviewed.
Unscented bath products
Not yet reviewed.
Unscented spa options
Not yet reviewed.
So far, the hotel says: The signature spa journey begins with an ‘aromatic body exfoliation’ and offers a Thai massage either ‘aromatic with herbal compresses, or dry’. The centre has an infrared sauna and a steam room.
Our note. Whether treatments can be done without essential oils, and whether the steam room is scented, is not stated.
How we know
What we look for. Treatments, saunas and steam rooms available without essential oils or scent infusions.
Why it matters. Essential oils are fragrance: the EU’s scientific committee lists several natural extracts, as well as single fragrance chemicals, among established contact allergens. A shared sauna with a scent infusion is hard to avoid.
Source: EU Scientific Committee on Consumer Safety, Opinion on fragrance allergens in cosmetic products ()
Source 1: Hotel website: wellnessUndated · read 22 Oct 2026
Know something about fragrance here that we don’t? Tell us
Air
What you breathe for eight hours a night: smoke history, fresh air, filtration and anything burning in the room.
Smoke-free property
Not yet reviewed.
Opening windows
Hotel-reportedonly some rooms or areas
The hotel says: The Deluxe Ocean Pool Pavilion opens through sliding doors onto its own outdoor terrace and ‘soft ocean breeze’.
Our note. Described for this pavilion type; other room types are not described in the same words.
How we know
What we look for. Guest rooms have windows or doors that open to outside air.
Why it matters. The US EPA lists opening windows, when outdoor air allows, as a way to dilute pollutants released indoors. An opening window lets guests air a room themselves when it smells of cleaning products or new furnishings.
Source: US EPA, Improving indoor air quality ()
Source 2: Hotel website: Deluxe Ocean Pool PavilionUndated · read 22 Oct 2026
Filtered fresh air
Not yet reviewed.
In-room air purifier
Not yet reviewed.
No in-room combustion
Not yet reviewed.
Know something about air here that we don’t? Tell us
Cleaning & care
How a room is cleaned, treated and prepared, and whether a request for a gentler clean is actually honored.
Low-chemical housekeeping
Not yet reviewed.
No ozone or biocide treatments
Not yet reviewed.
Low-chemical pest control
Not yet reviewed.
Sensitive-guest preparation
Not yet reviewed.
Know something about cleaning & care here that we don’t? Tell us
Sleep & materials
The textiles, mattress and floor you spend the night closest to, and how allergen-aware the room is.
Tested or organic bed linen
Not yet reviewed.
Mattress materials disclosed
Not yet reviewed.
Hard floors
Not yet reviewed.
Allergy-friendly rooms
Not yet reviewed.
Pet-free rooms
Not yet reviewed.
Know something about sleep & materials here that we don’t? Tell us
Water & pools
Drinking water, shower water and pool air.
Filtered or tested drinking water
Not yet reviewed.
Water safety plan
Not yet reviewed.
Shower filters
Not yet reviewed.
Shown for information; not scored.
Outdoor or low-chloramine pools
Hotel-reportedonly some rooms or areas
The hotel says: Pool Pavilions and Villas have private swimming pools on their outdoor terraces, and guests have use of a cold plunge pool.
Our note. The main pool and how the pools are treated are not described.
Shown for information; not scored.
How we know
What we look for. Pools are outdoors, or indoor pools have dedicated ventilation and monitored combined chlorine.
Why it matters. Chloramines irritate the skin, eyes and airways, and they build up in the air of indoor pools without enough ventilation. Outdoor pools, and good ventilation for indoor ones, keep levels low.
Source: US CDC, Chloramines and pool operation ()
Source 3: Hotel website: accommodationUndated · read 22 Oct 2026
Context, not scored: almost every pool in this catalog is outdoors, so it says little about one hotel against another.
Know something about water & pools here that we don’t? Tell us
Food
Allergen care first; where the produce comes from second.
Allergen-aware kitchen
Not yet reviewed.
Garden or organic produce
Hotel-reportedonly some rooms or areas
The hotel says: At Arva, the Italian restaurant, the menu has ‘fresh, organic ingredients at its core’, and the kitchen ‘sources fresh, organic produce from the local community’.
Our note. Described for Arva only; the resort’s other restaurants are not described in the same terms.
Shown for information; not scored.
How we know
What we look for. A meaningful share of the kitchen’s produce is grown on site or certified organic.
Why it matters. A large review found detectable pesticide residues about four times as often in conventional crops as in organic ones. Over a short stay the difference in exposure is small, so we show this as a note on the kitchen, not a scored health factor.
Source: Barański et al., British Journal of Nutrition, Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses ()
Source 4: Hotel website: Arva restaurantUndated · read 22 Oct 2026
Kitchen note, not scored.
Know something about food here that we don’t? Tell us
Light & quiet
Darkness and silence at night, and radio-quiet options for guests who want them.
Darkness and quiet
Not yet reviewed.
Radio-quiet options
Not yet reviewed.
Shown for information; not scored.
Know something about light & quiet here that we don’t? Tell us
Building
The materials a hotel was built and renovated with, how it handles damp, and what third parties have certified.
Low-emitting materials
Not yet reviewed.
Leak and mold response
Not yet reviewed.
Building certification
Not yet reviewed.
Shown for information; not scored.
Know something about building here that we don’t? Tell us
Notes & sources
- Hotel website: wellness, Undated · read 22 Oct 2026
- Hotel website: Deluxe Ocean Pool Pavilion, Undated · read 22 Oct 2026
- Hotel website: accommodation, Undated · read 22 Oct 2026
- Hotel website: Arva restaurant, Undated · read 22 Oct 2026
- Hotel website: home page, Undated · read 22 Oct 2026
- Wikipedia: Amanpuri, Undated · read 22 Oct 2026
- Hotel website: medical services, Undated · read 22 Oct 2026
- Hotel website: Wellness Immersions, Undated · read 22 Oct 2026
Room count: Not stated on the resort’s own site; Wikipedia lists 40 pavilions and 44 villas, with up to nine bedrooms in a villa. Hotel website (opens the hotel’s website)
Photographs: Amanpuri; Amanpuri; Amanpuri; Amanpuri; Amanpuri; Amanpuri
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