Caratfill SUB-Q is the firmest, most structural member of the Caratfill line, a cross-linked sodium-hyaluronate dermal filler at 24 mg/ml with 0.3% lidocaine in a 1.1 ml syringe. The manufacturer positions it for the strongest support and deepest placement of the three. It is placed by a trained professional, and the guide is below.

What is Caratfill SUB-Q, and where does it sit?

SUB-Q is the firmest texture in a three-variant family. All three share the same 24 mg/ml HA, the same 0.3% lidocaine, and the same 1.1 ml syringe. What changes is gel firmness and the general depth each is aimed at. SUB-Q is positioned as the most structural, offering the strongest support of the line for deeper placement.

Hyaluronic acid is a sugar your body already makes. As a cross-linked filler, it adds volume by binding water under the skin, then the body gradually breaks it down over months, so even the firmest variant is temporary. For finer, more superficial work the line offers the soft Caratfill KISS; for moderate volume it offers Caratfill DEEP. SUB-Q is the firm, supportive end of that range.

Log Notes. This describes SUB-Q within its line at a high level. It gives no needle sizes, depths, injection points, per-area amounts, or technique, all of which live in the official guide and belong to a trained professional. Nothing here is medical advice, and this is not a do-it-yourself procedure.

How does the cross-linking and NSE technology work?

Through HA chemistry plus extra processing. Cross-linking binds HA chains so a firmer gel resists breakdown and holds its shape under more load. The cross-linking agent is BDDE, and minimizing residual BDDE is a safety priority across HA fillers, as the FDA’s dermal filler overview notes for the category.

Caratfill’s patented NSE (Naturally Safe Effective) technology is the line’s signature claim. The manufacturer states it minimizes chemical deformation, preserves long-chain HA for longevity, and keeps BDDE residue very low (manufacturer states under 0.2 ppm, with endotoxin under 0.03 EU/mg). They cite a 48-week double-blind nasolabial-fold study referenced against Restylane. These are manufacturer and study claims, not guarantees for any individual.

What should you expect, and what’s worth tracking?

A firmer, more structural result that still fades over months, so dated notes matter. Because every HA filler is temporary, the practical question is how long your SUB-Q result holds before a review or top-up. Photograph consistently from visit to visit and track how the area changes rather than trusting memory.

With Dosefi you can add Caratfill SUB-Q as a treatment, log each session date with a photo, set a reminder for the review or top-up window, and self-rate how long the result lasts. Note which variant was used, KISS, DEEP, or SUB-Q, so a switch between them can be compared cleanly later. For a contrasting HA approach, see our notes on Profhilo.

A grounded takeaway

Caratfill SUB-Q is the firmest, most structural HA filler in the line, positioned for deeper support and built on the brand’s low-BDDE NSE technology. Expect a temporary, water-binding result, keep a dated record, and leave candidacy, variant choice, and the procedure to a licensed professional. The official guide is attached for your own reference.

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