LEFTOSE® is a Singapore-associated health and pharmaceutical brand best known for products containing lysozyme hydrochloride, a naturally occurring enzyme derived from egg white. The brand focuses primarily on throat comfort, phlegm and upper-respiratory discomfort, and is sold in several dosage forms including tablets, syrup and lozenges. 1

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LEFTOSE has been marketed in Singapore for more than four decades. Its original positioning centered on lysozyme-based tablets, which were traditionally dispensed through clinics and healthcare professionals. The brand subsequently expanded its range into formulations intended for different age groups and preferences, including syrup and lozenges. 3

The company describes LEFTOSE as the “original Lysozyme brand” and says it has been trusted by generations for over 40 years.

LEFTOSE’s history is closely connected with the use of lysozyme in Singaporean healthcare. A 2017 publication from Singapore’s Health Sciences Authority listed LEFTOSE among the lysozyme-containing products then registered as therapeutic products in Singapore. HSA subsequently announced the deregistration of lysozyme-containing products as therapeutic products, with existing registrations continuing until the end of 2018.

This regulatory history is important when discussing LEFTOSE: the brand’s current consumer-health positioning should not automatically be interpreted as evidence that its products have the same regulatory status or therapeutic indications they historically had.

Lysozyme is an enzyme naturally present in several human secretions, including tears and saliva, and is also found in egg white. LEFTOSE uses lysozyme hydrochloride derived from egg white as its principal active ingredient.

The ingredient is the defining feature of the LEFTOSE brand. Rather than relying on a conventional local anaesthetic to numb the throat, LEFTOSE’s lozenge products are positioned around lysozyme as their active ingredient. The company also describes its products as non-drowsy.

LEFTOSE Tablets

The tablets are the brand’s traditional/core product.

Each tablet contains 30 mg of lysozyme hydrochloride, according to the brand’s FAQ. They are marketed for throat discomfort and as a convenient formulation for adults.

The brand describes the tablets as:

• Small and easy to swallow
• Non-drowsy
• Convenient to carry
• Intended to soothe throat discomfort
• Suitable for adults according to the current product information

LEFTOSE Syrup

LEFTOSE Syrup is the child-oriented formulation.

The product contains 5 mg of lysozyme hydrochloride per mL and is formulated as a liquid for people who have difficulty swallowing tablets, particularly children.

The manufacturer describes the syrup as:

• Non-drowsy
• Sugar-free
• Naturally derived
• Suitable for children in specified age groups
• Intended to soothe throat discomfort and support clearer airways

Current Singapore retail information lists the syrup as originating from Singapore. 4

LEFTOSE Lozenges

LEFTOSE later expanded into lozenges, providing a more conventional throat-lozenge format.

The range includes:

• Honey Lemon — 90 mg LyzoMAX per lozenge
• Cool Mint — available in the Singapore range
• MAX Blackcurrant — 120 mg LyzoMAX per lozenge

LyzoMAX is the brand’s formulation based on lysozyme hydrochloride. The MAX formulation additionally contains vitamin C and zinc according to the brand’s FAQ.

The lozenges are promoted as sugar-free and non-drowsy. Unlike numbing lozenges, LEFTOSE says its lozenges do not numb the tongue.

LEFTOSE’s marketing is built around several recurring ideas:

Natural ingredient.
The brand emphasizes that its principal ingredient, lysozyme, occurs naturally in the human body and is derived from egg white for its products.

Non-drowsiness.
LEFTOSE consistently positions its products as non-drowsy, differentiating them from some cough-and-cold medicines that may cause drowsiness.

Family use.
The range spans tablets, children’s syrup and adult-oriented lozenges, allowing the brand to address different age groups and preferences.

Long heritage.
The company strongly emphasizes its history in Singapore, describing LEFTOSE as a product trusted by generations for more than 40 years.

LEFTOSE has a substantial retail presence in Singapore. Current listings can be found through major pharmacy and supermarket channels, including Watsons and FairPrice, in addition to clinics and independent pharmacies.

Watsons’ current catalogue, for example, lists five LEFTOSE products spanning tablets, syrup and several lozenge variants. 5

The brand’s official site also directs consumers toward clinics and major retail pharmacies. 6

LEFTOSE is associated with Wellchem Pharmaceuticals Pte Ltd in Singapore. Wellchem’s published contact information lists its office at Henderson Road, Singapore, and its product pages identify LEFTOSE as one of its brands.

The brand’s official website is while Wellchem provides additional product information at

There is an important distinction between LEFTOSE’s marketing claims and independent evidence.

LEFTOSE’s current website describes its products as remedies for throat discomfort and airway/phlegm-related symptoms. However, Singapore’s HSA conducted a benefit-risk reassessment of lysozyme-containing therapeutic products and announced their deregistration as therapeutic products in Singapore.

Therefore, claims such as “fast relief,” “effective,” or “proven results” should be understood as brand/product claims, rather than automatically treating them as conclusions established by contemporary clinical evidence.

A Singapore physician’s review also notes that evidence for LEFTOSE’s effectiveness is limited and discusses the regulatory history of lysozyme products in Singapore. 7

One of the most important characteristics of LEFTOSE is that its lysozyme is derived from egg white. Consequently, the brand states that its products may not be suitable for people with egg allergies.

This warning appears across the company’s product information and retail listings.

As of 2026, LEFTOSE remains a recognizable Singapore health brand, with its product portfolio centered on lysozyme-based throat and respiratory-comfort products. Its current range combines its traditional tablet format with children’s syrup and modern lozenge variants.

Its strongest distinguishing characteristics are its long Singapore market history, lysozyme-based formulation, non-drowsy positioning, and broad pharmacy distribution.

In one sentence

LEFTOSE® is a long-established Singapore-associated healthcare brand specializing in lysozyme hydrochloride-based tablets, syrup and lozenges marketed primarily for throat comfort and phlegm/upper-respiratory symptoms, with a claimed history of more than 40 years.

1. Home – Leftose | Natural remedy, Throat comfort
2. Leftose® Tablets
3. Leftose® Singapore | Natural Lysozyme-Based Support for the Whole Family – Leftose
4. LEFTOSE Syrup 2-In-1 Remedy Dissolves Phlegm & Soothes Sore Throats 100ml
5. Leftose® Syrup
6. Leftose
7. Leftose Tablets (Lysozyme Hydrochloride) – Truth or Fiction?