Syncly Social Index
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Hair
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K18 Leave-In Molecular Repair Mask on video, September 2026
The K18 Leave-In Molecular Repair Hair Mask appeared in 165 short videos in September 2026, and its share of beauty video held flat versus August after a jump from July. Advent calendar unboxings and a #k18partner campaign pairing the mask with the Peptide Prep Detox Shampoo made up much of the month. Sampled reactions were mostly positive, with almost no complaints.
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Key numbers
165
short-form videos mentioned it this month
change in share of beauty videos vs. last month
13%
of sampled videos mention it without a caption tag
65%
of sampled organic videos are positive
Most-viewed videos about Leave-In Molecular Repair Mask
The most-viewed short-form videos mentioning the product this month.
Share of beauty videos mentioning Leave-In Molecular Repair Mask
Monthly share of short-form beauty videos that mention the product, June to September 2026.
What videos say about Leave-In Molecular Repair Mask
Creators mostly talk about damaged or bleached hair (10 of 38 sampled videos), soft and smooth results (6), curl definition (6) and shine (4). The routine they show is simple: shampoo, towel-dry, apply a few pumps, leave it in for four minutes, then style, as in this damage routine and this curly-hair reset. Some skip conditioner when they use it.
Paid posts pair the mask with the Peptide Prep Detox Shampoo on colour-treated hair, as in this first try and this curl reset. Advent calendar breakdowns, such as this Sephora calendar video, put the mask in front of large audiences.
How creators open their videos
Top keywords
What people like
The strongest praise comes from repeat users. One creator says it transformed her hair and is worth the money, another is on her third bottle after bleaching, and a September empties video calls it her favourite hair product. An Italian review says it rescued hair damaged by dye, sea and flat irons.
Praise themes
What people complain about
Complaints were rare in our sample. A pharmacist notes it is expensive, and a routine price tally lists it at $75. A seven-day #k18partner test on dry curls calls the result "not perfect" but better.
Complaint themes
Alternatives and dupes
Few sampled videos name a dupe. A dermatologist tier list puts a L'Oréal Professionnel mask at budget, a Minimalist bond repair mask at basic and K18 at best, and a split-end explainer lists Olaplex No.3 Plus after K18. No video in the sample picked another product over K18.
Products named as alternatives
Where and who
Instagram carries 60% of September videos, TikTok 34% and YouTube Shorts 6%. 6.7% passed 100,000 views. In our sample, 12 of 38 videos were sponsored, and the #k18partner hashtag appears on roughly 32 of the 165 videos. Among organic videos, 65% were positive. 13% of sampled videos never named K18 in the caption or tags.
Platforms
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Frequently asked questions
See how your products perform on video
The Syncly Social Index scores brands from 0 to 100 using short-form video on TikTok, Instagram Reels and YouTube Shorts. It combines six signals: video share of voice (25%), untagged mentions (20%), momentum (15%), sentiment (15%), high-reach videos (15%) and creator breadth (10%). Each signal is scored relative to the other brands in the same category for the month. Sentiment and untagged figures come from a sample of videos; any claim about a specific video links to that video.