Injectable Treatments Explained

The Five Categories of Injectable Treatment

Understanding the different categories of injectable treatment is the most important first step. Each category works by a different mechanism and addresses different concerns. Choosing the right treatment starts with understanding what each one does.

1. Anti-wrinkle injections (neuromodulators)

Anti-wrinkle injections contain a purified protein (botulinum toxin type A) that temporarily relaxes specific facial muscles. By reducing the repetitive muscle contractions that cause dynamic wrinkles, these injections smooth lines on the forehead, between the brows (frown lines), and around the eyes (crow's feet). The treatment does not add volume and does not change the structure of the skin. It works purely by modulating muscle activity.

Results typically appear within three to five days, reach their full effect at two weeks, and last three to four months. In the UK, botulinum toxin is a prescription-only medicine, which means it must be prescribed by a qualified medical professional such as a doctor, dentist, or prescribing nurse. The injection itself may be performed by a trained healthcare professional under the prescriber's governance.

A common misconception is that anti-wrinkle injections will leave you unable to express emotion or looking “frozen.” When administered conservatively by a skilled practitioner, the result should be a natural softening of lines with preserved facial expression. The goal is to look refreshed, not rigid.

2. Dermal fillers

Dermal fillers are gel-based substances injected beneath the skin to add volume, restore contour, and soften lines. The vast majority of fillers used in reputable UK clinics are based on hyaluronic acid (HA), a naturally occurring substance in the skin that attracts and retains moisture. HA fillers come in different consistencies and formulations, each designed for specific areas and purposes: thicker, more structured fillers for the cheeks and jawline; softer, more pliable fillers for the lips and fine lines.

One of the key safety advantages of HA fillers is that they can be dissolved using an enzyme called hyaluronidase. This provides a safety net in the event of an adverse outcome or complication. Results are immediate (though final results settle over one to two weeks) and typically last six to eighteen months depending on the area treated and the product used.

It is important to understand that fillers and anti-wrinkle injections are completely different treatments. They work by different mechanisms, treat different concerns, and are not interchangeable. Our comparison guide explains the distinction in detail.

3. Skin boosters and bio-remodellers

Profhilo is the best-known example in this category. Unlike traditional fillers, skin boosters and bio-remodellers are not designed to add volume or change facial contour. Instead, they disperse hyaluronic acid widely throughout the tissue to improve skin quality from within. Profhilo stimulates the production of collagen, elastin, and adipocytes (fat cells), resulting in improved hydration, firmness, and overall skin radiance.

These treatments are ideal for patients whose primary concern is skin quality rather than volume or wrinkle reduction. They are particularly effective on the face, neck, hands, and décolletage. A typical course involves two to three sessions spaced two to four weeks apart, with maintenance treatments every six to twelve months. For a detailed comparison of products in this category, see our Profhilo vs skin boosters comparison.

4. Polynucleotides

Polynucleotides are a newer category of injectable that has generated considerable clinical interest. These products contain purified DNA fragments (derived from salmon or trout DNA) that stimulate fibroblast activity, promote tissue repair, and improve skin hydration and elasticity. They work at a cellular level to support the skin's natural regenerative processes.

Polynucleotides are particularly effective for areas where the skin is thin and delicate, such as the under-eye area, neck, and perioral region. They can be used as a standalone treatment or in combination with other injectables. Most patients have a course of two to four sessions, and results develop progressively over the weeks following treatment.

5. Biostimulators

Biostimulators such as Julaine (poly-L-lactic acid) work differently from HA fillers. Rather than adding immediate volume, they stimulate your body's own collagen production over time. The injected material gradually breaks down and is replaced by new collagen that your body produces in response. Results are not immediate but develop over two to three months and can last up to two years.

Biostimulators are particularly suited to patients who want gradual, natural-looking improvement in facial volume and skin quality. Because the results are produced by your own collagen, they tend to look and feel very natural. The trade-off is that results take longer to appear and are not reversible in the way that HA fillers are.

Common Myths About Injectables

The internet is full of misinformation about injectable treatments. Here are some of the most common myths we encounter, along with the reality.

• Myth:

  “Once you start, you can't stop.”

  This is false. There is no physical dependency associated with any injectable treatment. If you stop having anti-wrinkle injections, your muscles will gradually return to their normal activity and your wrinkles will reappear at the rate they would have done naturally. If you stop having fillers, the product will be absorbed by your body over time and your face will return to its pre-treatment appearance. You will not look worse than if you had never had treatment.

• Myth:

  “Injectables are only for older people.”

  Aesthetic injectables are used by patients across a wide age range. Younger patients may benefit from preventative anti-wrinkle treatment or skin-quality treatments like Profhilo. The right time to start depends on your individual concerns and goals, not your age.

• Myth:

  “All injectables look obvious and unnatural.”

  The results that attract attention online tend to be the most extreme examples. The vast majority of well-administered injectable treatments are subtle and natural-looking. If a treatment is done well, other people should notice that you look refreshed, not that you have had “work done.”

• Myth:

  “Cheaper is just as good.”

  Price variation in aesthetic treatments reflects differences in product quality, practitioner training, clinical governance, and aftercare. Heavily discounted treatments often mean compromises in one or more of these areas. A low price should prompt questions, not celebration.

Questions to Ask Before Your First Treatment

Walking into a first consultation can feel daunting, particularly if you are unsure what to ask. The following questions are a good starting point:

• What treatment do you recommend for my concerns, and why?
• What are the alternatives to the treatment you are recommending?
• What results can I realistically expect?
• What are the risks and potential side effects?
• What product will you use, and why have you chosen it?
• How many sessions will I need, and how much will the full course cost?
• What happens if I am unhappy with the results?
• What is your complication management protocol?
• Are you insured for the treatments you perform?
• Can I see before-and-after examples of your work?

A good practitioner will welcome these questions. If someone is dismissive, evasive, or rushes through the answers, take that as useful information about how they are likely to approach your treatment and aftercare.