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TSP’s 4th Anniversary Serum, The Serum No. 4 (The Super Hydrating Serum), is the most powerful and effective hydration formula!
Serum No. 4 helps with long-lasting hydration and visible anti-ageing benefits, all in one bottle! This advanced serum is formulated to replenish moisture deep within the skin while supporting collagen production for firmer, smoother skin over time.
✔ Formulated with skin-loving ingredients
At the core of this formulation is erythritol, a naturally derived, edible sugar alcohol known for its exceptional water-binding properties. Present in a high concentration, erythritol acts as a powerful ingredient, drawing and retaining moisture in the skin to keep it hydrated throughout the day. This is complemented by a unique blend of three fruit extracts: watermelon, apple, and lentil—that not only nourish the skin but also reinforce its ability to hold moisture, reducing trans-epidermal water loss.
To enhance the serum’s hydrating performance, we’ve included a marine-derived compound that helps maintain skin hydration over a longer period of time, leaving the skin soft, supple, and refreshed. For those concerned with signs of ageing, this serum also features a collagen-boosting peptide that supports skin elasticity and helps smooth the appearance of fine lines and wrinkles.
While the serum may feel slightly sticky upon initial application or if applied too thick, this sensation quickly disappears as the serum absorbs into the skin, leaving behind a dewy, plump finish that lasts.
| Formulated by Pharmacists | Clear Results | Personalised Skincare |
See it, feel it! Trust the formulation.
The TSP Serum No.4 belongs to the Serum Range. Find out more about the rest of the range:
MORE INFORMATION
INGREDIENTS
Aqua, erythritol, palmitoyl tripeptide-38, glycerin, hydroxypropyl cyclodextrin, homarine hydrochloride, citrullus vulgaris (watermelon) fruit extract, pyrus malus (apple) fruit extract, lens esculenta (lentil) fruit extract, sodium PCA, sodium lactate, propanediol, panthenol, , caprylic/capric triglyceride, polyglyceryl-4 isostearate, sodium hyaluronate, benzoic acid.
DIRECTIONS OF USE
Apply 3 to 4 drops to face area up to four times daily for effect.
FAQS
Q: What makes Serum No.4 different from other hydrating serums?
A: It is formulated with a high concentration of erythritol, a naturally derived sugar that acts as a powerful humectant, drawing moisture deep into the skin and holding it there
Q: Who is this serum best suited for?
A: This serum is perfect for dry to normal skin types or anyone experiencing dehydration, dullness, or early signs of ageing. If your skin feels tight, flaky, or looks tired, Serum No.4 can help restore a plump, radiant appearance. Oily skin types may prefer to use a smaller amount to avoid a heavy feel.
Q: Why does it feel sticky at first?
A: Due to its high concentration of humectants like erythritol, the serum may feel slightly sticky on initial application, especially if too much is used. This stickiness usually fades within minutes as the serum absorbs into your skin. For best results, apply a thin layer and allow it to fully absorb before layering other products.
made with the best skincare ingredients
Erythritol
A natural sugar alcohol and powerful humectant, erythritol attracts and retains water in the skin, helping to maintain moisture levels over time. It is particularly effective in long-lasting hydration, making it the star of this formula.
Watermelon, Apple & Lentil Extracts
A powerful additional hydration complex made from three carefully selected fruit extracts that work synergistically to deeply hydrate, nourish, and protect the skin.
Glycerin
A popular and effective humectant, widely used in skincare for its moisturising and skin-barrier protecting propertires. It draws moisture from the air and deeper layers of the skin, helping to keep the skin hydrated and supple.
How natural is this product?
This product has a leaf rating of 2
A mix of natural and non-natural ingredients
Our Product Promise
No Alcohol
No Parabens
No Sodium Lauryl Sulphate (SLS)
No Petroleum-Based Ingredients
No Propylene Glycol
No Artificial Coloring Or Fragrance
No Artificial Preservatives
3 reviews for Serum No.4 (The Super Hydrating Serum)
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Natalie (Verified Purchase) –
This was recommended to me earlier in 2022 and I am currently at my 2nd bottle now. My skin is receptive to it so far and it has been a positive experience using it. However, as an avid user of TSP products since 2017, I would say that the effects of their serums are quite slow in general. You need go through at least 2 bottles to see visible improvement in your skin. I hope TSP would improve their formulation over time. Your serums are really not cheap and I expect better results given the amount that I am paying.
Anonymous (Verified Purchase) –
Works as described. Note that this cannot replace a moisturiser, you will need to follow up with one after using this serum.
Anonymous (Verified Purchase) –